Quote:
Originally Posted by strongmanmike
Cool stuff Big Al  she's a whopper! 
Mike |
Thanks Mike,
I find the angular sizes of astronomical objects interesting.
In this case.
The Moon has an average diameter of 31 arc minutes = 31' - so
M31 Andromeda at 199.5'/31 appears as over 6 times the Moon's diameter !
IC2531 is 6.6' so it appears as 6.6/31 = 0.21
or about
1/5th the size of the Moon even though it's
about 120 million light years away.
That is large - very large.
cheers
Allan