Galaxy Facts

Galaxy Facts
A galaxy is a huge collection of gas, dust, and stars held together by gravity. Most galaxies contain at least a trillion stars. There are trillions of galaxies in the universe. Galaxies are grouped according to shape type. The three galaxy types are elliptical, spiral and irregular.
Interesting Galaxy Facts:
The idea of a galaxy was first realized by Thomas Wright in 1917.
Galaxies pass through each other all the time but because the stars are so spread out, the chances of them actually touching is very unlikely.
Elliptical galaxies contain some of the oldest stars because they do not have the ability to form new stars.
Elliptical galaxies often appear to have one bright star in the middle but it is actually a collection of stars.
Elliptical galaxies are so bright that if Earth were located inside of one, there would always be day light everywhere no matter the time of day.
Irregular galaxies are those that do not fit in any other type.
A lot of irregular galaxies probably began as an elliptical or spiral galaxy that crashed into another galaxy.
From the southern hemisphere of Earth, two other galaxies can be seen with the naked eye.
A small galaxy is one that contains less than a billion stars.
Our galaxy, the Milky Way, is a spiral galaxy.
The largest galaxies in the universe may be up to two million light-years long.
Sometimes galaxies merge with other galaxies to form a galactic merger.
The origin of galaxies is debatable but most astronomers believe they were caused by the big bang.
There are four galaxies that can be seen from Earth with the naked eye: the Milky Way, the Andromeda Galaxy, and the Small and Large Magellanic Clouds.
The closest galaxy to the Milky Way is about 80,000 light-years away.

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