Quote:
Originally Posted by peter_4059
Interesting point - I checked out the distances and they are all similar (give or take 10 million ly's.
NGC1365 65 million ly (extends 200,000 ly)
NGC1097 53 million ly
NGC1566 51 million ly
I selected these based on an astroplanner search sorted by angular size and magnitude. Judging by the image scale in the pictures I guess that means they are all similar in actual size?
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To better measure the actual size of the galaxies, given their angular size, just use the small angle formula and plug the variables into the equation. That way, you'll get a better approximation of their size, rather than relying on the image scale, which is normally deceptive.