The early quantitative success of astronomy, compared with other natural sciences such as physics, chemistry, biology, and meteorology (which were also cultivated in antiquity but which did not reach the same level of accomplishment), stems from several causes. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!Īstronomy was the first natural science to reach a high level of sophistication and predictive ability, which it achieved already in the second half of the 1st millennium bce.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.This article was originally published on The Conversation by Jack Singal at the University of Richmond. How to answer this question will need to be figured out by a future scientist. Scientists now consider it unlikely the universe has an end - a region where the galaxies stop or where there would be a barrier of some kind marking the end of space.īut nobody knows for sure. In either case, you could never get to the end of the universe or space. If this were the case for the universe, it would mean it is not infinitely big – although it would still be bigger than you can imagine. If you start walking in any direction, east for example, and just keep going, eventually you would come back to where you began. One way to think about this is to picture a globe and imagine that you are a creature that can move only on the surface. Some scientists think it’s possible the universe might eventually wrap back around on itself - so if you could just keep going out, you would someday come back around to where you started, from the other direction. In that case, the universe would be infinite, with no end. Many think it’s likely you would just keep passing galaxies in every direction, forever. These are questions scientists don’t have definite answers to yet. If you could keep going out, as far as you wanted, would you just keep passing by galaxies forever? Are there an infinite number of galaxies in every direction? Or does the whole thing eventually end? And if it does end, what does it end with? The dots would keep moving farther apart, just like the galaxies are. You can visualize this by imagining tiny dots on a deflated balloon and then thinking about blowing it up. If you could watch for long enough, over millions of years, it would look like new space is gradually being added between all the galaxies. Using big telescopes, astronomers see millions of galaxies out there – and they just keep going, in every direction. Most of that space is almost completely empty, with only some stray molecules and tiny mysterious invisible particles scientists call “dark matter.” You would have to travel through millions of trillions more miles of space just to reach another galaxy. Michael Miller/Stocktrek Images via Getty Images
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