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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...

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Black Hole

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36,586 просмотров • 7 месяцев назад •via X (Twitter)

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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)
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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)

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A vapor cone, also known as a shock collar or Mach diamond, is a visible cloud of condensed water that can sometimes form around an object moving through moist air at high speeds, such as a fighter jet approaching the sound barrier.
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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

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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:
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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:

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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.

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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.

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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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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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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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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

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What would happen if the Moon took the place of the ISS? 🌕 If our satellite were positioned at the altitude of the ISS orbit (about 400 km), life on Earth would change forever. The Moon would fill almost the entire sky, eclipsing the Sun during every orbit—a journey that would take just 90 minutes. The gravitational pull of such a massive object at close range would instantly trigger colossal ocean tides hundreds of meters high, washing away coastal cities on a daily basis. Earth's atmosphere would gradually be stripped away into space, and the planet and the Moon would collide within a few days due to immense tidal forces.

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The Ghost of Cassiopeia: a cosmic phantom in the glow of a volatile star 👻 Located 550 light-years from Earth, the IC 63 nebula is a ghostly cloud of dust and gas. It is gradually being eroded by the intense radiation from a nearby, unpredictable star: Gamma Cassiopeiae. Autumn and winter are the best times to observe this remarkable object from the Northern Hemisphere. 🔭

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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.
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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.

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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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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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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.
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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.

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you can play around with it here: (made in 45m on the 7 train!) how it works: each vertical line represents an instrument. a note is played when an object crosses the line, and where it crosses vertically determines pitch. ty Bobby Thakkar Replit ⠕ & team for such a fun day!
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you can play around with it here: (made in 45m on the 7 train!) how it works: each vertical line represents an instrument. a note is played when an object crosses the line, and where it crosses vertically determines pitch. ty Bobby Thakkar Replit ⠕ & team for such a fun day!

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