Curious Kids<\/a>\u00a0is a collection for kids of all ages. When you’ve got a query you\u2019d like an knowledgeable to reply, ship it to\u00a0CuriousKidsUS@theconversation.com.<\/em><\/p>\n “How will the Universe finish? \u2013 Iez M., age 9, Rochester, New Yor<\/em>ok<\/p>\n Whether or not the universe will \u201cfinish\u201d in any respect is just not sure, however all proof suggests it’ll proceed being humanity\u2019s cosmic residence for a really, very very long time.<\/p>\n The universe\u2014all of house and time, and all matter and power\u2014started about 14 billion years in the past in a rapid expansion<\/a> referred to as the Big Bang<\/a>, however since then it has been in a state of steady change. First, it was stuffed with a diffuse gasoline of the particles that now make up atoms: protons<\/a>, neutrons<\/a>, and electrons<\/a>. Then, that gasoline collapsed into stars and galaxies<\/a>.<\/p>\n Our present principle for the historical past of the universe. On the left is the Massive Bang roughly 14 billion years in the past. The construction and make-up of the universe have modified over time. Picture Credit score: NASA\/WMAP Science Team<\/a><\/p>\n<\/div>\n Our understanding of the way forward for the universe is knowledgeable by the objects and processes we observe right this moment. As an astrophysicist<\/a>, I observe objects like distant galaxies, which lets me research how stars and galaxies change over time. By doing so, I develop theories that predict how the universe will change sooner or later.<\/p>\n Predicting the way forward for the universe by extending what we see right this moment is extrapolation<\/a>. It\u2019s dangerous, as a result of one thing surprising may occur.<\/p>\n Interpolation<\/a>\u2014connecting the dots inside a dataset\u2014is far safer. Think about you may have an image of your self once you had been 5 years previous, after which one other once you had been 7 years previous. Somebody may most likely guess what you seemed like once you had been 6. That\u2019s interpolation.<\/p>\n Utilizing an image of the creator when he was 5 years previous and seven years previous, you can interpolate what he seemed like when he was 6 years previous, however you couldn\u2019t predict what he would seem like at 29. Picture Credit score: Stephen DiKerby<\/p>\n<\/div>\n Possibly they may extrapolate from the 2 footage to what you\u2019d seem like when you’re 8 or 9 years previous, however nobody can precisely predict too far into the longer term. Possibly in a number of years you get glasses or abruptly get actually tall.<\/p>\n Scientists can predict what the universe will most likely seem like a number of billion years into the longer term by extrapolating how stars and galaxies change over time, however ultimately issues may get bizarre. The universe and the stuff inside may as soon as once more change, prefer it has up to now.<\/p>\n Excellent news: The solar, our medium-sized yellow star, goes to proceed shining for billions of years. It\u2019s about midway by way of its 10 billion-year lifetime<\/a>. The lifetime of a star depends upon its dimension. Massive, sizzling, blue stars stay shorter lives, whereas tiny, cool, pink stars live for much longer<\/a>.<\/p>\n Right now, some galaxies are nonetheless producing new stars, however others have depleted their star-forming gasoline. When a galaxy stops forming stars, the blue stars rapidly go \u201csupernova\u201d and disappear<\/a>, exploding after only some million years. Then, billions of years later, the yellow stars just like the solar eject their outer layers into a nebula<\/a>, leaving solely the pink stars puttering alongside. Ultimately, all galaxies all through the universe will cease producing new stars, and the starlight filling the universe will progressively redden and dim.<\/p>\n Pink dwarf stars are the longest-lived sort of stars. As soon as star formation shuts down all through the universe, ultimately solely pink stars might be left, progressively fading away over trillions of years. Picture Credit score: NASA\/ESA\/STScI\/G. Bacon<\/a><\/p>\n<\/div>\n In trillions of years\u2014lots of of occasions longer than the universe\u2019s present age\u2014these pink stars can even fade away into darkness. However till then, there might be plenty of stars offering gentle and heat.<\/p>\n<\/div>\n Consider constructing a sand citadel on the seaside. Every bucket of sand makes the citadel larger and larger. Galaxies develop over time in an analogous approach by eating up smaller galaxies<\/a>. These galactic mergers will proceed into the longer term.<\/p>\n In galaxy clusters, lots of of galaxies fall inward towards their shared heart, usually leading to messy collisions. In these mergers, spiral galaxies<\/a>, that are orderly disks, mix in chaotic methods into disordered blob-shaped clouds of stars. Consider how straightforward it’s to show a well-constructed sand citadel into an enormous mess by kicking it over.<\/p>\n For that reason, the universe over time may have fewer spiral galaxies and extra elliptical galaxies as a result of the spiral galaxies mix into elliptical galaxies.<\/p>\n The Milky Approach galaxy and the neighboring Andromeda galaxy<\/a> may mix on this approach in a number of billion years. Don\u2019t fear: The celebrities in every galaxy would whiz past each other totally unharmed<\/a>, and future stargazers would get a improbable view of the 2 galaxies merging.<\/p>\n The Massive Bang kick-started an growth that most likely will proceed sooner or later. The gravity of all of the stuff within the universe\u2014stars, galaxies, gasoline, darkish matter\u2014pulls inward and slows down the growth, and a few theories counsel that the universe\u2019s growth will coast along or slow to a halt<\/a>.<\/p>\n Nevertheless, some proof means that some unknown power is beginning to exert a repulsive power, inflicting growth to hurry up. Scientists name this outward power dark energy<\/a>, however little or no is understood about it. Like raisins in a baking cookie, galaxies will zoom away from each other faster and faster<\/a>. If this continues into the longer term, different galaxies is perhaps too far aside to watch from the Milky Approach.<\/p>\n To summarize the most effective present prediction of the longer term: Star formation will shut down, so galaxies might be stuffed with previous, pink, dim stars progressively cooling into darkness. Every group or cluster of galaxies will merge right into a single, large, elliptical galaxy. The accelerated growth of the universe will make it inconceivable to watch different galaxies past the native group.<\/p>\n This situation ultimately winds down right into a darkish eternity, lasting trillions of years. New knowledge may come to gentle that adjustments this story, and the following stage within the universe\u2019s historical past is perhaps one thing completely completely different and unexpectedly lovely. Relying on the way you take a look at it, the universe may not have an \u201cfinish,\u201d in any case. Even when what exists could be very completely different from how the universe is now, it\u2019s arduous to examine a distant future the place the universe is solely gone.<\/p>\n How does this situation make you’re feeling? It typically makes me really feel wistful, which is a kind of disappointment, however then I bear in mind we stay at a really thrilling time within the story of the universe: proper at the beginning, in an period stuffed with thrilling stars and galaxies to watch! The cosmos can help human society and curiosity for billions of years into the longer term, so there\u2019s plenty of time to maintain exploring and trying to find solutions.<\/p>\n This text is republished from The Conversation<\/a> below a Inventive Commons license. Learn the original article<\/a>.<\/em><\/p>\n<\/div>\n![\"A](\"https:\/\/singularityhub.com\/uploads\/2025\/12\/image-1.jpeg\")
<\/div>\nPredicting the Future by Learning the Previous?<\/h2>\n
![\"A](\"https:\/\/singularityhub.com\/uploads\/2025\/12\/image.png\")
<\/a><\/p>\nHow Will Stars Change within the Future?<\/h2>\n
![\"An](\"https:\/\/singularityhub.com\/uploads\/2025\/12\/image.jpeg\")
<\/div>\nHow Will Galaxies Change within the Future?<\/h2>\n
How Will the Universe Itself Change within the Future?<\/h2>\n