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A journey through space 🚀 This image, captured by the #NIRCam on Webb, features the galaxy cluster MACS J0553.4-3342. It is so vast that its gravity causes light to curve, revealing distant galaxies – including galaxies from less than a billion years after the Big Bang! 1/2

ESA Webb Telescope

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32,486 次观看 • 3 天前 •via X (Twitter)

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Messier 88 (M88) is on a journey to the innermost reaches of the Virgo Cluster, a collection of more than 1000 galaxies bound by gravity, orbiting the massive elliptical galaxy at the centre 👹🌌 1/3

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New JWST image of hundreds of galaxies in a protocluster 10 billion light years away! This is the spiderweb protocluster. #nasa #space #astronomy #science

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More than a hundred galaxies can be seen in this image of Abell 209 – but there’s even more to this galaxy cluster! 🤯 A more elusive part of it is dark matter: a form of matter that does not interact with light. 1/3

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Getting up close with the Cat’s Paw Nebula 🐈 This image, captured by the #NIRCam on board Webb, features a small detail of the nearby star-forming region known as the Cat’s Paw Nebula. 1/3

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15,920 次观看 • 1 年前

$Experience the Euclid Galaxy Atlas Fly through! 🌌✨ This video is an artistic cosmos featuring real galaxy images captured by the Euclid telescope. These galaxies are just a tiny fraction of the entire collection from Euclid Early Release Observation.$

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Brian Cox is pointing at one dot. The dot is a galaxy with 100 billion stars. There are 200 billion more on the same map. The thin line at the top of that map represents a billion light-years. At the speed of light, it would take a billion years to cross that sliver. The math gets stranger. The observable universe holds roughly 30 sextillion stars. Every grain of sand on every beach on Earth combined is about 7.5 sextillion. The universe has 4x more stars than Earth has sand. The deeper number is which of those galaxies you can ever actually reach. Dark energy is accelerating cosmic expansion. Space itself is stretching faster than light can cross it. The cosmic event horizon sits at roughly 16 billion light-years from Earth. Anything past that is moving away from us faster than light can chase. We can see those galaxies because their photons left billions of years ago when the gap was small enough. We cannot reach them. We cannot send a signal. We cannot know what they look like now. 97% of the galaxies on Cox's map are already disconnected from our future. Visible artifacts of a past that has ended. Now look forward. In about 150 billion years, accelerating redshift will push every galaxy outside our Local Group beyond detection. Andromeda will have merged with the Milky Way. The other 199,999,999,999 galaxies will be invisible. Civilizations on planets around future stars will look up and see only one galaxy. Their telescopes will tell them the universe ends at the edge of the Local Group. They will not see cosmic background radiation. They will not observe expansion. They will not know about the Big Bang. The evidence will have receded past their light cone. Every astronomy textbook they could ever write would conclude the universe is small, static, and made of one galaxy. We exist in a 100-billion-year window where the universe is still legible. Before us, too hot, too dense, too young. After us, the lights go out one galaxy at a time. 30 sextillion stars on the map. A 100-billion-year window in which to read it. We exist inside the only overlap.

Brian Cox is pointing at one dot. The dot is a galaxy with 100 billion stars. There are 200 billion more on the same map. The thin line at the top of that map represents a billion light-years. At the speed of light, it would take a billion years to cross that sliver. The math gets stranger. The observable universe holds roughly 30 sextillion stars. Every grain of sand on every beach on Earth combined is about 7.5 sextillion. The universe has 4x more stars than Earth has sand. The deeper number is which of those galaxies you can ever actually reach. Dark energy is accelerating cosmic expansion. Space itself is stretching faster than light can cross it. The cosmic event horizon sits at roughly 16 billion light-years from Earth. Anything past that is moving away from us faster than light can chase. We can see those galaxies because their photons left billions of years ago when the gap was small enough. We cannot reach them. We cannot send a signal. We cannot know what they look like now. 97% of the galaxies on Cox's map are already disconnected from our future. Visible artifacts of a past that has ended. Now look forward. In about 150 billion years, accelerating redshift will push every galaxy outside our Local Group beyond detection. Andromeda will have merged with the Milky Way. The other 199,999,999,999 galaxies will be invisible. Civilizations on planets around future stars will look up and see only one galaxy. Their telescopes will tell them the universe ends at the edge of the Local Group. They will not see cosmic background radiation. They will not observe expansion. They will not know about the Big Bang. The evidence will have receded past their light cone. Every astronomy textbook they could ever write would conclude the universe is small, static, and made of one galaxy. We exist in a 100-billion-year window where the universe is still legible. Before us, too hot, too dense, too young. After us, the lights go out one galaxy at a time. 30 sextillion stars on the map. A 100-billion-year window in which to read it. We exist inside the only overlap.

Aakash Gupta

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Black Hole

33,706 次观看 • 1 年前

This is Messier 82 (M82), better known as the Cigar Galaxy. M82 has been observed many times before, including by HUBBLE but its details have until now been shrouded by dust. After 65 hours of observations with the #NIRCam on Webb, which can pierce through this dust, M82 has been revealed in all its sparkling glory. There are approximately 16.5 million stars visible in this image! 🤯 Read more: #WebbSeesFarther 📷 NASA , European Space Agency , Canadian Space Agency , A. Smercina (STScI), T. Williams (University of Manchester), A. Pagan (STScI), N. Bartmann (ESA/Webb) 3/3 🎶 Stellardrone - Twilight

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ESA Webb Telescope

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With Hubble, astronomers have learned to expect the unexpected in our universe. A new discovery shows why: Hubble detected ultraviolet light escaping from a galaxy that existed just 1.4 billion years after the big bang. Learn more:

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Hubble

91,711 次观看 • 23 天前

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Voyager is making history again. Launched in 1977, the spacecraft will reach a unique distance of one light-day from Earth in 2026. Voyager 1 is now 24 billion kilometers away and continues its journey through interstellar space, remaining the most distant human-made object. The Golden Record, containing a message to extraterrestrials, is still on board.

Black Hole

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HUBBLE

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Another Galaxy Without Dark Matter Dark matter is thought to account for about 85% of the Universe's total mass, yet there are galaxies that stubbornly refuse to conform to this rule. A team of astronomers led by researchers from Yale, using the Keck Observatory, has discovered a third such galaxy: the faint dwarf DF9, which appears to lack invisible mass entirely. The concept of dark matter emerged in the 1970s, when Vera Rubin first convincingly demonstrated that galaxies are held together by some form of invisible mass. Since then, a wealth of indirect evidence—such as galactic halos and gravitational lensing—has accumulated. This makes the exceptions all the more intriguing. DF9 sits alongside two other similarly "empty" galaxies—DF2 and DF4—as part of an elongated chain of seven galaxies located 45 million light-years away; all of them appear to have originated from a single event. How was this determined? By analyzing stellar motion, the team estimated DF9's mass at approximately 100 million solar masses—a figure that matches the combined mass of its visible stars, gas, and dust. Had dark matter been present, the total mass would have been roughly a hundred times greater. The necessary precision was achieved using the KCWI spectrograph on the Keck telescope, an instrument specifically designed to detect extremely faint light sources. It appears that DF2, DF4, and DF9 formed during a high-speed galactic collision that stripped gas clouds away from their dark matter halos, allowing the new galaxies to coalesce from ordinary matter alone. Lead author Michael Keim notes that a chain of dark-matter-free galaxies has never been observed before. His supervisor, Pieter van Dokkum, adds that this provides compelling evidence that dark matter is a genuine physical substance rather than merely a "correction" to the theory of gravity.

Another Galaxy Without Dark Matter Dark matter is thought to account for about 85% of the Universe's total mass, yet there are galaxies that stubbornly refuse to conform to this rule. A team of astronomers led by researchers from Yale, using the Keck Observatory, has discovered a third such galaxy: the faint dwarf DF9, which appears to lack invisible mass entirely. The concept of dark matter emerged in the 1970s, when Vera Rubin first convincingly demonstrated that galaxies are held together by some form of invisible mass. Since then, a wealth of indirect evidence—such as galactic halos and gravitational lensing—has accumulated. This makes the exceptions all the more intriguing. DF9 sits alongside two other similarly "empty" galaxies—DF2 and DF4—as part of an elongated chain of seven galaxies located 45 million light-years away; all of them appear to have originated from a single event. How was this determined? By analyzing stellar motion, the team estimated DF9's mass at approximately 100 million solar masses—a figure that matches the combined mass of its visible stars, gas, and dust. Had dark matter been present, the total mass would have been roughly a hundred times greater. The necessary precision was achieved using the KCWI spectrograph on the Keck telescope, an instrument specifically designed to detect extremely faint light sources. It appears that DF2, DF4, and DF9 formed during a high-speed galactic collision that stripped gas clouds away from their dark matter halos, allowing the new galaxies to coalesce from ordinary matter alone. Lead author Michael Keim notes that a chain of dark-matter-free galaxies has never been observed before. His supervisor, Pieter van Dokkum, adds that this provides compelling evidence that dark matter is a genuine physical substance rather than merely a "correction" to the theory of gravity.

Black Hole

23,825 次观看 • 13 天前