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Whether the Universe will 'end' at all is not certain, but all evidence suggests it will continue being humanity's cosmic home for a very, very long time.As an astrophysicist , I observe objects like distant galaxies, which lets me study how stars and galaxies change over time.
By doing so, I develop theories that predict how the Universe will change in the future.– connecting the dots within a dataset – is much safer. Imagine you have a picture of yourself when you were 5 years old, and then another when you were 7 years old. Someone could probably guess what you looked like when you were 6. That's interpolation. Using a picture of the author when he was 5 years old and 7 years old, you could interpolate what he looked like when he was 6 years old, but you couldn't predict what he would look like at 29. Maybe they could extrapolate from the two pictures to what you'd look like when you are 8 or 9 years old, but no one can accurately predict too far into the future. Maybe in a few years you get glasses or suddenly get really tall. Scientists can predict what the universe will probably look like a few billion years into the future by extrapolating how stars and galaxies change over time, but eventually things could get weird. The Universe and the stuff within might once again change, like it has in the past.Good news: The Sun, our medium-sized yellow star, is going to continue shining for billions of years. It's about halfway through its. The lifetime of a star depends on its size. Big, hot, blue stars live shorter lives, while tiny, cool, red stars Today, some galaxies are still producing new stars, but others have depleted their star-forming gas. When a galaxy stops forming stars, the blue stars quickly, leaving only the red stars puttering along. Eventually, all galaxies throughout the Universe will stop producing new stars, and the starlight filling the Universe will gradually redden and dim. Red dwarf stars are the longest-lived type of stars. Once star formation shuts down throughout the universe, eventually only red stars will be left, gradually fading away over trillions of years. ( In trillions of years – hundreds of times longer than the Universe's current age – these red stars will also fade away into darkness.How will galaxies change in the future? Think of building a sand castle on the beach. Each bucket of sand makes the castle bigger and bigger. Galaxies grow over time in a similar way byIn galaxy clusters, hundreds of galaxies fall inward toward their shared center, often resulting in messy collisions. In these mergers,, which are orderly disks, combine in chaotic ways into disordered blob-shaped clouds of stars. Think of how easy it is to turn a well-constructed sand castle into a big mess by kicking it over. For this reason, the Universe over time will have fewer spiral galaxies and more elliptical galaxies because the spiral galaxies combine into elliptical galaxies.How will the universe itself change in the future? The Big Bang kick-started an expansion that will probably continue in the future. The gravity of all the stuff in the Universe – stars, galaxies, gas,However, some evidence suggests that some unknown force is starting to exert a repulsive force, causing expansion to speed up. Scientists call this outward forceAfter star formation shuts down and galaxies merge into huge ellipticals, the expansion of the universe might mean that other galaxies are impossible to observe. For trillions of years, this might be the view of the unchanging night sky: a single red elliptical galaxy. ( To summarize the best current prediction of the future: Star formation will shut down, so galaxies will be full of old, red, dim stars, gradually cooling into darkness. Each group or cluster of galaxies will merge into a single, massive, elliptical galaxy. The accelerated expansion of the Universe will make it impossible to observe other galaxies beyond the local group. This scenario eventually winds down into a dark eternity, lasting trillions of years. New data might come to light that changes this story, and the next stage in the Universe's history might be something totally different and unexpectedly beautiful. Depending on how you look at it, the Universe might not have an 'end,' after all. Even if what exists is very different from how the Universe is now, it's hard to envision a distant future where the Universe is entirely gone. How does this scenario make you feel? It sometimes makes me feel wistful, which is a type of sadness, but then I remember we live at a very exciting time in the story of the Universe: right at the start, in an era full of exciting stars and galaxies to observe! The cosmos can support human society and curiosity for billions of years into the future, so there's lots of time to keep exploring and searching for answers.
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