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Gravitational lensing, also known as an Einstein ring This occurs when the strong gravitational pull of a massive object warps spacetime around it so much that light and other forms of electromagnetic radiation are deflected from a straight path. For example, animations show how a black hole passing in... show more

Black Hole

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Cecilia Chirenti & her team discovered this pair of spinning neutron stars smashing into each other, forming a single massive star, then collapsing into a black hole. The sound is gravitational waves. (from old NASA satellite data)

Cecilia Chirenti & her team discovered this pair of spinning neutron stars smashing into each other, forming a single massive star, then collapsing into a black hole. The sound is gravitational waves. (from old NASA satellite data)

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When a nuclear reactor is switched on for the first time, an intense, almost hypnotic blue glow appears in the water surrounding the reactor core. This light is neither fire nor heat; it is Cherenkov radiation, a physical phenomenon that occurs when charged particles, such as high-energy electrons produced during nuclear fission, travel through a transparent medium faster than light can propagate within that same medium. While nothing can exceed the speed of light in a vacuum, light travels more slowly in materials like water. When a charged particle surpasses this reduced speed, it emits a coherent shock-like electromagnetic wave, often described as an optical analogue of a sonic boom. This radiation produces the distinctive blue glow. The colour arises because Cherenkov radiation is strongest at shorter wavelengths, which are dominated by blue and ultraviolet light. The phenomenon was first observed experimentally in 1934 and later explained theoretically, work that led to the Nobel Prize in Physics in 1958. Its explanation confirmed how relativity and electromagnetism operate in material media. Today, this deep blue light is both a warning and a scientific tool. It signals the presence of intense ionising radiation, while also being exploited in particle detectors, nuclear reactors, and neutrino observatories. It provides a rare, visible manifestation of subatomic processes that are otherwise hidden from direct human perception. #GottaLovePhysics #Physics

When a nuclear reactor is switched on for the first time, an intense, almost hypnotic blue glow appears in the water surrounding the reactor core. This light is neither fire nor heat; it is Cherenkov radiation, a physical phenomenon that occurs when charged particles, such as high-energy electrons produced during nuclear fission, travel through a transparent medium faster than light can propagate within that same medium. While nothing can exceed the speed of light in a vacuum, light travels more slowly in materials like water. When a charged particle surpasses this reduced speed, it emits a coherent shock-like electromagnetic wave, often described as an optical analogue of a sonic boom. This radiation produces the distinctive blue glow. The colour arises because Cherenkov radiation is strongest at shorter wavelengths, which are dominated by blue and ultraviolet light. The phenomenon was first observed experimentally in 1934 and later explained theoretically, work that led to the Nobel Prize in Physics in 1958. Its explanation confirmed how relativity and electromagnetism operate in material media. Today, this deep blue light is both a warning and a scientific tool. It signals the presence of intense ionising radiation, while also being exploited in particle detectors, nuclear reactors, and neutrino observatories. It provides a rare, visible manifestation of subatomic processes that are otherwise hidden from direct human perception. #GottaLovePhysics #Physics

Erika 

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It's Black Hole Friday! This computer simulation shows a gas cloud encountering two supermassive black holes. As gravitational and frictional forces meet, the cloud condenses and heats. Each time the black holes orbit, some of the gas is ejected. Learn how scientists use data like this to improve their observations and understanding of cosmic systems:

It's Black Hole Friday! This computer simulation shows a gas cloud encountering two supermassive black holes. As gravitational and frictional forces meet, the cloud condenses and heats. Each time the black holes orbit, some of the gas is ejected. Learn how scientists use data like this to improve their observations and understanding of cosmic systems:

NASA Ames

54,961 views • 7 months ago

y[1+(y′)^2]=k The Brachistochrone problem is the ultimate "work smarter, not harder" of the physical world. While a straight line is the shortest distance, the cycloid is the fastest path because it front-loads acceleration. It’s a beautiful reminder that in a gravitational field, the most direct route is rarely the most efficient. This is the Calculus of Variations in its most visceral, satisfying form. Seeing the cycloid absolutely dust the straight line never gets old; it’s where mathematical optimization meets physical reality.

y[1+(y′)^2]=k The Brachistochrone problem is the ultimate "work smarter, not harder" of the physical world. While a straight line is the shortest distance, the cycloid is the fastest path because it front-loads acceleration. It’s a beautiful reminder that in a gravitational field, the most direct route is rarely the most efficient. This is the Calculus of Variations in its most visceral, satisfying form. Seeing the cycloid absolutely dust the straight line never gets old; it’s where mathematical optimization meets physical reality.

Mathematica

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Surgical lights cast no visible shadow Each light source emits beams from different angles. When an object, such as a hand, blocks one of the beams, the remaining beams continue to light the area, effectively preventing shadows from forming. This design ensures that surgeons have a consistently well-lit view of the operating area.

Surgical lights cast no visible shadow Each light source emits beams from different angles. When an object, such as a hand, blocks one of the beams, the remaining beams continue to light the area, effectively preventing shadows from forming. This design ensures that surgeons have a consistently well-lit view of the operating area.

HOW THINGS WORK

290,772 views • 2 years ago

How a "Lubor’s lens" works. This is a type of Fresnel lens that takes the light coming into it from the back at obtuse angles and projects it forward in the front of the lens [📹 NightHawkInLight]

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Massimo

1,458,100 views • 2 years ago

Most of us grew up seeing simplified diagrams of the Hubble Space Telescope and assumed the James Webb Space Telescope follows a similar path around Earth. In reality, it operates in a very different region of space. It is not orbiting our planet in the traditional sense but instead travels around a point about 1.5 million kilometers away known as the Sun–Earth L2 point, keeping pace with Earth as both move around the Sun. This location is often described as a gravitational balance point, but it is not truly stable or neutral. JWST does not sit still there; it follows a controlled orbit around L2 and requires periodic adjustments to stay on course. The result is a delicate, engineered dance between gravity and motion, where the telescope remains aligned with Earth while staying far from its heat and light, allowing it to observe the universe with extraordinary clarity.

Most of us grew up seeing simplified diagrams of the Hubble Space Telescope and assumed the James Webb Space Telescope follows a similar path around Earth. In reality, it operates in a very different region of space. It is not orbiting our planet in the traditional sense but instead travels around a point about 1.5 million kilometers away known as the Sun–Earth L2 point, keeping pace with Earth as both move around the Sun. This location is often described as a gravitational balance point, but it is not truly stable or neutral. JWST does not sit still there; it follows a controlled orbit around L2 and requires periodic adjustments to stay on course. The result is a delicate, engineered dance between gravity and motion, where the telescope remains aligned with Earth while staying far from its heat and light, allowing it to observe the universe with extraordinary clarity.

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31,985 views • 2 months ago

When you make a wormhole, you're not accelerating the object, you're manipulating the medium. That's why it looks like the object simply slips out of spacetime. The wormhole works just like in a wave pool with an implosive singularity at the center. This plane is being sent backwards perpendicular to the axis of the orbs rotation.

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Ashton Forbes

34,211 views • 4 months ago

When a spacecraft leaves Earth, it doesn’t just fire its engines and head straight to its destination. In many missions, especially those going beyond low Earth orbit, there’s a more subtle and elegant strategy at play, one that uses gravity itself as part of the navigation system. This is often called a gravity assist, or a slingshot maneuver. But in the case of missions like #Artemis II, what’s being used is a closely related idea known as a free-return trajectory. At first glance, it might sound simple: the spacecraft goes to the Moon, loops around it, and comes back. But the physics behind it is anything but simple. Instead of relying on continuous propulsion, the spacecraft follows a carefully calculated path through the gravitational field of the Earth–Moon system. It is launched with just the right speed and direction so that, as it approaches the Moon, the Moon’s gravity bends its trajectory. The spacecraft is effectively flung around the Moon, redirected onto a path that naturally brings it back toward Earth. No major engine burn is needed for the return. Small trajectory corrections may still be required, but gravity does the heavy lifting. That’s the key. This kind of trajectory is not just efficient, it’s also safe. If something goes wrong with the spacecraft’s engines or onboard systems, gravity itself ensures the return. It’s an inherent backup plan, built into the trajectory from the very beginning. The same fundamental idea appears in gravity assists used across the Solar System. When a spacecraft flies past a planet, it can gain or lose speed by exchanging momentum with that planet. From the spacecraft’s point of view, it’s as if it has been accelerated without using fuel. In reality, it has borrowed a tiny amount of orbital energy from the planet itself. That’s how missions like Voyager reached the outer planets, and how probes continue to explore regions far beyond what their onboard fuel alone would allow. But there’s an important distinction. An interplanetary gravity assist is typically used to change speed and direction, often increasing the spacecraft’s energy. A free-return trajectory, like the one used in Artemis II, is designed for something more specific: a path that naturally loops back to Earth without requiring additional propulsion. It’s less about gaining energy, and more about shaping a trajectory that guarantees a return. To understand why this works, it helps to stop thinking in straight lines. In space, motion follows curves defined by gravity. The spacecraft is constantly falling, first toward Earth, then toward the Moon, and then back toward Earth again. What looks like a loop is really a continuous free fall through a changing gravitational landscape. This way of navigating space reveals something deeper. We tend to think of engines as the drivers of motion, but once a spacecraft is on its way, gravity does most of the work. The art of spaceflight is not just about thrust. It’s about knowing when not to use it. #GoodLuck #Artemis NASA Artemis

When a spacecraft leaves Earth, it doesn’t just fire its engines and head straight to its destination. In many missions, especially those going beyond low Earth orbit, there’s a more subtle and elegant strategy at play, one that uses gravity itself as part of the navigation system. This is often called a gravity assist, or a slingshot maneuver. But in the case of missions like #Artemis II, what’s being used is a closely related idea known as a free-return trajectory. At first glance, it might sound simple: the spacecraft goes to the Moon, loops around it, and comes back. But the physics behind it is anything but simple. Instead of relying on continuous propulsion, the spacecraft follows a carefully calculated path through the gravitational field of the Earth–Moon system. It is launched with just the right speed and direction so that, as it approaches the Moon, the Moon’s gravity bends its trajectory. The spacecraft is effectively flung around the Moon, redirected onto a path that naturally brings it back toward Earth. No major engine burn is needed for the return. Small trajectory corrections may still be required, but gravity does the heavy lifting. That’s the key. This kind of trajectory is not just efficient, it’s also safe. If something goes wrong with the spacecraft’s engines or onboard systems, gravity itself ensures the return. It’s an inherent backup plan, built into the trajectory from the very beginning. The same fundamental idea appears in gravity assists used across the Solar System. When a spacecraft flies past a planet, it can gain or lose speed by exchanging momentum with that planet. From the spacecraft’s point of view, it’s as if it has been accelerated without using fuel. In reality, it has borrowed a tiny amount of orbital energy from the planet itself. That’s how missions like Voyager reached the outer planets, and how probes continue to explore regions far beyond what their onboard fuel alone would allow. But there’s an important distinction. An interplanetary gravity assist is typically used to change speed and direction, often increasing the spacecraft’s energy. A free-return trajectory, like the one used in Artemis II, is designed for something more specific: a path that naturally loops back to Earth without requiring additional propulsion. It’s less about gaining energy, and more about shaping a trajectory that guarantees a return. To understand why this works, it helps to stop thinking in straight lines. In space, motion follows curves defined by gravity. The spacecraft is constantly falling, first toward Earth, then toward the Moon, and then back toward Earth again. What looks like a loop is really a continuous free fall through a changing gravitational landscape. This way of navigating space reveals something deeper. We tend to think of engines as the drivers of motion, but once a spacecraft is on its way, gravity does most of the work. The art of spaceflight is not just about thrust. It’s about knowing when not to use it. #GoodLuck #Artemis NASA Artemis

Erika 

234,886 views • 3 months ago

When a nuclear reactor powers on for the first time, the core fills with a deep blue glow that feels almost unreal as it rises through the water in a quiet surge of energy. The light is Cherenkov radiation, created when charged particles move through the water faster than light can travel in that medium, a discovery made in the 1930s that revealed a new way to see high energy reactions. Every appearance of this glow is a reminder of how powerful atomic reactions can be, showing a rare moment where raw physics becomes something visible and strangely beautiful.

When a nuclear reactor powers on for the first time, the core fills with a deep blue glow that feels almost unreal as it rises through the water in a quiet surge of energy. The light is Cherenkov radiation, created when charged particles move through the water faster than light can travel in that medium, a discovery made in the 1930s that revealed a new way to see high energy reactions. Every appearance of this glow is a reminder of how powerful atomic reactions can be, showing a rare moment where raw physics becomes something visible and strangely beautiful.

Today In History

383,805 views • 1 month ago

It is believed that chanting this stotram three times a day, for six months, fulfils the wishes of devotees. The Yantrodharaka Hanumat Stotram is a hymn in the praise of Lord Hanuman written by Shri Vyasaraja (Vyasatirtha). One day, when sage Vyasaraja was meditating on the banks of River Tungabhadra, he obtained a vision of Lord Hanuman. In order to capture this vision, he etched an image of a monkey on a rock. To his great surprise, the monkey from the illustration came alive. So, he etched an image once again. But, a live monkey materialised from the image once more. So, he repeated this process twelve times. After the twelfth time, he drew a monkey and encased it within a geometric pattern (a yantra) so that it wouldn't incarnate. Hence, the idol came to be known as the 'Yantrodharaka Hanuman' or the 'Hanuman held in the yantra'. Today, one finds a temple around this idol, known as the Yantrodharaka Hanuman Temple, near Hampi.

It is believed that chanting this stotram three times a day, for six months, fulfils the wishes of devotees. The Yantrodharaka Hanumat Stotram is a hymn in the praise of Lord Hanuman written by Shri Vyasaraja (Vyasatirtha). One day, when sage Vyasaraja was meditating on the banks of River Tungabhadra, he obtained a vision of Lord Hanuman. In order to capture this vision, he etched an image of a monkey on a rock. To his great surprise, the monkey from the illustration came alive. So, he etched an image once again. But, a live monkey materialised from the image once more. So, he repeated this process twelve times. After the twelfth time, he drew a monkey and encased it within a geometric pattern (a yantra) so that it wouldn't incarnate. Hence, the idol came to be known as the 'Yantrodharaka Hanuman' or the 'Hanuman held in the yantra'. Today, one finds a temple around this idol, known as the Yantrodharaka Hanuman Temple, near Hampi.

Bhagavad Gita

23,406 views • 3 months ago

Look how this ball corrected itself twice with Magnetomers 🧲. Newton's First Law of Motion (Inertia) says an object remains at rest, or in motion at a constant speed in a straight line, unless it is acted upon by a force. What is done in the dark will come to light #FIFARIGGGED

Look how this ball corrected itself twice with Magnetomers 🧲. Newton's First Law of Motion (Inertia) says an object remains at rest, or in motion at a constant speed in a straight line, unless it is acted upon by a force. What is done in the dark will come to light #FIFARIGGGED

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Mummy of Pacheri : It is the mummy of a man about 1.65m tall, who lived during Ptolemaic Period (305-30 BC). It called 'Mummy of Pacheri', although the reading of the name remains problematic. The quality of its embalming, as well as the state of conservation make it a specimen noticeable and worthy of notice. The mummy is a perfect example for anyone wanting to understand the technique of embalming, and that is probably why it attracts such fascination from visitors. What adds to the charm of this mummy, is also its location in the museum. Indeed, located in a small niche at the back of the large sarcophagi room. At the top of the so-called Osiris crypt, the mummy is only visible in a certain dim light and remains well hidden, isolated from other artifacts, as if rest was a necessity for it in such a busy museum. According to the results of an X-ray analysis, this mummy is that of an adult man. His name, written hastily, can be read as either Pacheri or Nenu; the interpretation is still uncertain. The wide used collar covering his chest is formed of several rows of beads and includes falcon-headed clasps. The apron covering the body features various scenes arranged in registers, notably the mummy lying on a bed, surrounded by the goddesses Isis and Nephtys, and the four sons of Horus. Finally, the casing around the feet has two images of the funerary god Anubis. Louvre Museum (N 2627) 📽️© antiqua_archeologia (IG) - Subscribe for Weekly Newsletter - #archaeohistories

Mummy of Pacheri : It is the mummy of a man about 1.65m tall, who lived during Ptolemaic Period (305-30 BC). It called 'Mummy of Pacheri', although the reading of the name remains problematic. The quality of its embalming, as well as the state of conservation make it a specimen noticeable and worthy of notice. The mummy is a perfect example for anyone wanting to understand the technique of embalming, and that is probably why it attracts such fascination from visitors. What adds to the charm of this mummy, is also its location in the museum. Indeed, located in a small niche at the back of the large sarcophagi room. At the top of the so-called Osiris crypt, the mummy is only visible in a certain dim light and remains well hidden, isolated from other artifacts, as if rest was a necessity for it in such a busy museum. According to the results of an X-ray analysis, this mummy is that of an adult man. His name, written hastily, can be read as either Pacheri or Nenu; the interpretation is still uncertain. The wide used collar covering his chest is formed of several rows of beads and includes falcon-headed clasps. The apron covering the body features various scenes arranged in registers, notably the mummy lying on a bed, surrounded by the goddesses Isis and Nephtys, and the four sons of Horus. Finally, the casing around the feet has two images of the funerary god Anubis. Louvre Museum (N 2627) 📽️© antiqua_archeologia (IG) - Subscribe for Weekly Newsletter - #archaeohistories

Archaeo - Histories

57,028 views • 2 years ago

An anvil cloud (scientifically known as Cumulonimbus incus) is the flat, spreading top of a mature thunderstorm cloud. It forms when warm air rises rapidly, hits the stratosphere (a natural ceiling), and spreads horizontally. This is what it looks like from an airliner.

An anvil cloud (scientifically known as Cumulonimbus incus) is the flat, spreading top of a mature thunderstorm cloud. It forms when warm air rises rapidly, hits the stratosphere (a natural ceiling), and spreads horizontally. This is what it looks like from an airliner.

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Thousands of people are linking hands around Parliament as a unified call for an immediate ceasefire in Gaza as well as to send a strong message to Keir Starmer's new government to stop arming Israel. This is an amazing act of solidarity in the capital to show that the people stand with Palestine 🇵🇸

Thousands of people are linking hands around Parliament as a unified call for an immediate ceasefire in Gaza as well as to send a strong message to Keir Starmer's new government to stop arming Israel. This is an amazing act of solidarity in the capital to show that the people stand with Palestine 🇵🇸

Friends of Al Aqsa

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Dzhubga Dolmen and Doguab River Dolmen 4, 3rd–2nd millennium BC. These two Western Caucasus dolmens are around 4,000–5,000 years old and show the same Bronze Age building tradition: large stone slabs, massive capstones, and small front openings used for access to the burial chamber. Dzhubga is especially important because research recorded petroglyphs, a stone cairn, a retaining wall, and a circular yard in front of the chamber. Doguab River Dolmen 4 is known for its heavy overhanging capstone and round entrance, often called a “soul hole,” though archaeologists also describe it as a port-hole slab entrance. Same region, same building tradition, two strong examples of Bronze Age monumentality.

Dzhubga Dolmen and Doguab River Dolmen 4, 3rd–2nd millennium BC. These two Western Caucasus dolmens are around 4,000–5,000 years old and show the same Bronze Age building tradition: large stone slabs, massive capstones, and small front openings used for access to the burial chamber. Dzhubga is especially important because research recorded petroglyphs, a stone cairn, a retaining wall, and a circular yard in front of the chamber. Doguab River Dolmen 4 is known for its heavy overhanging capstone and round entrance, often called a “soul hole,” though archaeologists also describe it as a port-hole slab entrance. Same region, same building tradition, two strong examples of Bronze Age monumentality.

History Content

15,521 views • 1 month ago

Video diffusion models have strong implicit representations of 3D shape, material, and lighting, but controlling them with language is cumbersome, and control is critical for artists and animators. GenLit connects these implicit representations with a continuous 5D control signal describing the direction and intensity of a point light source. This enables single-image near-field relighting of an image using a video diffusion model. We use a ControlNet-like approach and show that, with a small amount of synthetic data, GenLit generalizes to complex real-world images. Given a single image and the 5D lighting signal, GenLit creates a video of a moving light source that is inside the scene. It moves around and behind scene objects, producing effects such as shading, cast shadows, secularities, and interreflections with a realism that is hard to obtain with traditional inverse rendering methods. GenLit shows that it is possible to get continuous control over implicit physical processes within a video model. I think this is just the beginning and promises to make such models much more practical for creators. Shrisha Bharadwaj will present today at SIGGRAPH Asia Room: S423/S424, Level 4 @ 13:50 on 15 of Dec.

Video diffusion models have strong implicit representations of 3D shape, material, and lighting, but controlling them with language is cumbersome, and control is critical for artists and animators. GenLit connects these implicit representations with a continuous 5D control signal describing the direction and intensity of a point light source. This enables single-image near-field relighting of an image using a video diffusion model. We use a ControlNet-like approach and show that, with a small amount of synthetic data, GenLit generalizes to complex real-world images. Given a single image and the 5D lighting signal, GenLit creates a video of a moving light source that is inside the scene. It moves around and behind scene objects, producing effects such as shading, cast shadows, secularities, and interreflections with a realism that is hard to obtain with traditional inverse rendering methods. GenLit shows that it is possible to get continuous control over implicit physical processes within a video model. I think this is just the beginning and promises to make such models much more practical for creators. Shrisha Bharadwaj will present today at SIGGRAPH Asia Room: S423/S424, Level 4 @ 13:50 on 15 of Dec.

Michael Black

22,144 views • 7 months ago

The Milky Way and Andromeda are currently separated by about 2.5 million light-years. Drawn together by gravity, Andromeda approaches us at roughly 110 km/s. Though this speed is immense, the vast cosmic distances mean the process will unfold slowly over billions of years. Recent studies using data from Hubble and Gaia suggest the long-predicted merger is not certain: there's roughly a 50% chance the galaxies will collide and merge within the next 10 billion years, with only a small probability of it beginning in the classic ~4–5 billion-year timeframe. As the galaxies interpenetrate, powerful gravitational tides would eject enormous streams of stars, gas, and dust—forming glowing tidal tails that trail across space like celestial ribbons. New star formation would flare in compressed gas clouds, lighting up the chaos with brilliant nebulae. Despite the dramatic term "collision," individual stars are so sparsely distributed that direct crashes would be exceedingly rare. Instead, gravity would gently reshuffle orbits: some systems flung to the outskirts, others spiraling toward a shared center. At the hearts of both galaxies lie supermassive black holes—ours at ~4 million solar masses, Andromeda's far larger. Over eons, they would inspiral and coalesce in a cataclysmic union, unleashing ripples of gravitational waves across the cosmos. In the end, the spirals we know would dissolve into a single, grand elliptical galaxy—a transformed beacon in the Local Group, born from one of the universe's most patient spectacles. 🎥 skywolf400

The Milky Way and Andromeda are currently separated by about 2.5 million light-years. Drawn together by gravity, Andromeda approaches us at roughly 110 km/s. Though this speed is immense, the vast cosmic distances mean the process will unfold slowly over billions of years. Recent studies using data from Hubble and Gaia suggest the long-predicted merger is not certain: there's roughly a 50% chance the galaxies will collide and merge within the next 10 billion years, with only a small probability of it beginning in the classic ~4–5 billion-year timeframe. As the galaxies interpenetrate, powerful gravitational tides would eject enormous streams of stars, gas, and dust—forming glowing tidal tails that trail across space like celestial ribbons. New star formation would flare in compressed gas clouds, lighting up the chaos with brilliant nebulae. Despite the dramatic term "collision," individual stars are so sparsely distributed that direct crashes would be exceedingly rare. Instead, gravity would gently reshuffle orbits: some systems flung to the outskirts, others spiraling toward a shared center. At the hearts of both galaxies lie supermassive black holes—ours at ~4 million solar masses, Andromeda's far larger. Over eons, they would inspiral and coalesce in a cataclysmic union, unleashing ripples of gravitational waves across the cosmos. In the end, the spirals we know would dissolve into a single, grand elliptical galaxy—a transformed beacon in the Local Group, born from one of the universe's most patient spectacles. 🎥 skywolf400

Dreams N Science

365,976 views • 6 months ago

This supermassive black hole holds a mass of nearly 66 billion Suns, making it the largest confirmed black hole ever discovered. Its event horizon is so vast that our entire solar system would disappear inside it, and time near its edge would slow almost to a stop. Located billions of light-years away, TON 618 shows us how powerful and mysterious the universe truly is.

This supermassive black hole holds a mass of nearly 66 billion Suns, making it the largest confirmed black hole ever discovered. Its event horizon is so vast that our entire solar system would disappear inside it, and time near its edge would slow almost to a stop. Located billions of light-years away, TON 618 shows us how powerful and mysterious the universe truly is.

Black Hole

79,460 views • 6 months ago