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Is this the weirdest thing we've seen in space? - Video học tiếng Anh
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Is this the weirdest thing we've seen in space?
Is this the weirdest thing we've seen in space?
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Legendas (53)
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- Scientists found something weird lurking in deep space
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or someone weird.
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Scientists actually found a stick figure
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millions of light years away,
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and it teaches us something
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pretty amazing about the universe.
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Astronomers used to think that after the Big Bang
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galaxies were spread out evenly.
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It's like if you have baked a loaf of raisin bread,
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you'd expect the raisins to be spread out evenly
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in the finished loaf.
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But in the 20th century, we got really good
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at measuring how far away galaxies are,
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and we did it by looking at the light they produce.
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Because the universe is expanding,
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galaxies are always moving away from us.
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As they move away, the light they send back
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gets stretched out and turns more red.
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That change is called redshift,
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and galaxies that are further away from us
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are also moving faster away from us,
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so they have more redshift.
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Astronomers have spent decades
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measuring the redshift of different galaxies
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so they can map out the universe.
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In the seventies and eighties, one group
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measured the distance to around 1,000 galaxies near us.
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They plugged their positions into a computer
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and then turn that into a two-dimensional map
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of the 3D universe.
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Probably so they could print it out on paper or something.
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Right there in the middle of the map,
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you can see a stick figure.
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It spans around 500 million light years,
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and it's made up of hundreds of galaxies.
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But this stick person was a pretty big discovery
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for astronomy, not just, 'cause it's weird and pretty cool,
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but because it showed us that our universe
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isn't so smoothly spread out after all.
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Going back to that raisin bread analogy,
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it's like if some raisins started in a little clump
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and they just happened to make a funny shape as they baked.
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Galaxy structures like the stick man
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are called superclusters,
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and they formed because of tiny fluctuations in energy
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that were around in the earliest days of the universe.
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As the universe has expanded, those tiny fluctuations
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have become those huge visible filaments
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that galaxies cluster around.
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So, next time someone disses your doodles
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as just a stick figure, let 'em know
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you're taking your inspiration from the universe.
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Follow me for more cool science videos.
