# astronomy

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The great galaxy in Andromeda has an angular diameter along its long axis of about 5 degree. Its distance is about 2.2 millons light years. What is its linear diameter.

• astronomy -

Convert 5 degrees to radians (about 0.09) and multiply that by the distance from Earth. That will give you the diameter.

It's a big one, like our Milky Way.

• astronomy -

.09 * 2.2 = .198

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