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Yes, it does, the rotation period can be calculated using 21cm radio waves and the Doppler principle.
Answer:
All galaxies rotate as do all planets around stars and just about everything else.
It is the centripetal force of rotation that prevents objects from falling together due to the attractive force of gravity.
If an isolated mass of stars or dust or gas were assembled in space and the contents had no rotational motion, the whole mass would begin to accelerate towards its own center due to gravity. So, while such clumps of matter can exist, they have all presumably condensed into planets or star or black holes.
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Why was it named the Andromeda galaxy?
The Andromeda galaxy is named after the constellation Andromeda, which is named after a princess in Greek mythology. The galaxy appears in the constellation Andromeda in the night sky.
When was The Andromeda Galaxy created?
The Andromeda Galaxy was created in 1992.
Why was the Andromeda galaxy named after Andromeda?
The Andromeda galaxy was named after the princess Andromeda from Greek mythology. The constellation Andromeda, in which the galaxy is found, is also named after her. It was named as such because of its proximity to the constellation and its association with the myth.
Are there other planets Andromeda galaxy?
We expect the Andromeda galaxy to be just like our own Milky Way galaxy. We can see stars (suns) in the Andromeda Galaxy and just as stars have planets orbiting them in our galaxy, we believe that there must be planets also orbiting stars in the Andromeda galaxy.
How bright is the Andromeda Galaxy?
The Andromeda Galaxy has an apparent magnitude of around 3.4, making it visible to the naked eye under dark skies. It is the brightest galaxy in the sky.
