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20 curiosities you didn't know about galaxies

2022-07-27 21:32:27Lifestyle SHKRUAR NGA REDAKSIA VOX
20 curiosities you didn't know about galaxies
galaxies

1 – The 18th century philosopher Immanuel Kant was one of the first people to theorize that the Milky Way was not the only galaxy in the universe. Kant coined the term island universe to describe a galaxy.

2 – Astronomers now believe there are 100 billion galaxies in the visible universe.

3 – One of the earliest uses of the term Milky Way was in Geoffrey Chaucer's 14th century poem The House of Fame. He compared the galaxy to a skyway.

4 – Due to the expansion of the universe, all other galaxies are moving away from ours. Galaxies further away from the Milky Way are moving away faster than those closer.

5 – Some of the galaxies leaving the Milky Way are ellipsoids, like soccer balls. Galaxies can also be thin and flat, just like the Milky Way.

6 – Galaxies are irregularly shaped, including many dwarf galaxies. These galaxies, the smallest in the universe, contain only a few hundred or thousands of stars.

7 – You will often find dwarf galaxies clustered around larger galaxies.

8 – Dwarf galaxies often lose their stars to their larger neighbors due to gravity.

9 – You can't see the big black hole at the center of the Milky Way, even if you've ever looked in the constellation Sagittarius.

10 – Most galaxies have a black hole at the center, and astronomers have found that this mass is about 1/1000 of the mass of the galaxy it belongs to.

11 – The two nearest galaxies to the Milky Way – the Small Magellanic Cloud and the Large Magellanic Cloud – may not have black holes. Or being very small galaxies, their holes are still too small to detect.

12 – Every galaxy contains dust. Produced by stars, dust makes light appear redder than it actually is, making it harder for astronomers to study the properties of stars.

13 – Dust can travel. Some galaxies, with galactic winds, scatter dust and gas at hundreds of kilometers per second into intergalactic space.

14 – Winds are caused by the pressure that stars exert on dust and gas. Fast galactic winds are located in distant star-forming galaxies in the Milky Way.

15 – The Milky Way rotates at 560,000 miles per hour, and makes one complete revolution every 200 million years.

16 – A galactic revolution ago, dinosaurs ruled the Earth

17 – Galaxies rotate faster than predicted based on the gravity of their stars.

18 – Galaxies are mostly empty spaces. If the stars within galaxies were shrunk to the size of oranges, they would be separated by 4,800 kilometers.

19 – If galaxies were shrunk to the size of apples, neighboring galaxies would be only a few meters apart. Their relative proximity indicates that they sometimes merge.

20 – In about 4 billion years, the Milky Way will merge with the Andromeda galaxy. The result of the merger process, which lasts at least 100 million years, will be the ellipsoidal galaxy named "Milkomeda".


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