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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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33,070 просмотров • 1 месяц назад •via X (Twitter)

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Galaxies are not isolated islands. When two galaxies pass close to one another, gravity can pull stars, gas, and even dark matter away from one galaxy and into another. One famous example involves the Milky Way slowly stripping stars from the Sagittarius Dwarf Spheroidal Galaxy. Vast streams of stolen stars now wrap around our galaxy like cosmic fingerprints of an ancient encounter, Astronomers have observed many such galactic thefts throughout the universe, revealing that galaxies grow not only by forming stars-but also by stealing them. Cinematic visuals and audio generated with Al. Source: NASA / ESA / Hubble Space Telescope / Galaxy Merger Research

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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.

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