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Old 03-21-2013, 09:49 AM   #1
pdurrant
The Grand Mouse
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How big is the Andromeda Galaxy?

A quick poll on an astronomy question!

Now, I'm not asking how big the Andromeda Galaxy (the nearest big galaxy to our own Milky Way) actually is, but how big it appears to be in our night sky.

Well, it's not very bright, but if it were lots brighter, so that we could see it easily, how big would it be in the sky, compared to the only object in the sky with a visible size that we can look at easily - the moon.

I've made a picture to help you, showing Andromeda and the moon, from 25x the width of the moon down to 1/5 the width of the moon. (You can imaging a tiny oval and a point size object, I'm sure!)

The answer is behind the spoiler. No peeking until you've voted in the poll!

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Last edited by pdurrant; 03-21-2013 at 10:45 AM.
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