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From candles to ladders: how astronomers measure very large distances in the universe


From candles to ladders: how astronomers measure very large distances in the universe
How do we know the universe is expanding? Your high school trigonometry is involved in the process.
Ever wondered how scientists know the distance to planets, stars, galaxies? Or even better, how to measure the universe’s size and its expansion?  Well, they certainly don’t have a giant ruler, but they have other tools including “candles” and “ladders”.
The Parallax and 1 parsec = 3.26 light-years. Credits: astronomy.com
The easiest way to measure things far from Earth is called parallax and was discovered by ancient scientists not just the Greeks (who are usually responsible for discovering things), but several other ancient societies with knowledge of astronomy. ....

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ESA - Through the clouds

ESA - Through the clouds
esa.int - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from esa.int Daily Mail and Mail on Sunday newspapers.

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NASA's Hubble Space Telescope reveals light warped by gravitry of galaxy cluster Abell 370 | Science | News


| UPDATED: 15:23, Thu, Jan 21, 2021
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NASA s picture of the cluster Abell 370 may at first glance appear to reveal a collection of unusually warped and twisted galaxies far from our own. But the image is not evidence of a whole new class of galaxies or the product of a fault in Hubble s imaging instruments. The twisted galaxies are not event part of the Abell 370 cluster, which sits about 4.9 billion light-years away. ....

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