How do you reduce 200 billion in our Milky Way galaxy to just 21? Focus on things that have changed people’s understanding of the Universe planets gift idea science lover astronomy new Shirt universe, as astronomer Giles Sparrow told DW.
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DW: Let’s start with the basics: We often talk about the stars in the night sky as if we could reach up and touch them. But even the nearest star to Earth is outside our solar system – in our galaxy, the Milky Way, but almost too far to understand. When you wrote the book The History of the Universe in 21 Stars (and 3 Forgeries), have you found a tangible way for non-astronomers to understand what we’re talking about?
Giles Sparrow: The most intuitive approach is to first understand that light is the fastest thing in the universe and it travels at 300,000 kilometers per second. And so, light from the Universe planets gift idea science lover astronomy new Shirt moon takes about a second and a half to reach Earth. When we sent astronauts to the moon, the radio signals took about that time to reach Earth. So I think, that gives you some idea of scale. For the rest of the universe, in the Milky Way, you’re talking about thousands of years for light to reach us on Earth, and from distant galaxies, it takes millions of years.
About 200 billion stars are in the Milky Way, and about how many galaxies are in the observable universe as well as stars in the Milky Way. And that’s just the observable universe, the area where light has had time to reach us since the Big Bang. The entire universe may stretch very far, far beyond that. And it is expanding. Scientists have found the Galaxy GN-z11 may not have a flashy name, but it appears to be the most distant and oldest ever discovered. Astronomers led by Nobunari Kashikawa, professor of astronomy at the Universe planets gift idea science lover astronomy new Shirt the University of Tokyo, embark on a mission to find the universe’s most observable distant galaxy, to learn more about how it is. formation and when.
Scientists believe that in a very hot and dense state shortly after the Big Bang, there must have been processes that favor matter over antimatter. This creates a small amount of excess matter, and as the universe cools, all antimatter is destroyed or destroyed by an equal amount of matter, leaving a very small amount of excess matter. . And it is this surplus that makes up everything we see in the universe today.