We live on a planet that along with the sun and the rest of the solar system is orbiting the centre of a galaxy we call the Milky Way. There are a few types of galaxies but the Milky Way is a spiral galaxy.
What is the nearest spiral galaxy to the Milky Way?
Andromeda / Pisces 11 / Sextans A
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Answer to question 3 / Andromeda galaxy.
The Andromeda Galaxy is a barred spiral galaxy with a diameter of about 220,000 light-years and approximately 2.5 million light-years from Earth.
Although very small compared to the vast Universe 2.5 million light-years is a very large distance, in one year light will travel 9.46 trillion kilometres, a trillion is 1 followed by 12 zeros.
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