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- Sun Oct 11, 2020 3:49 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Rubin's Galaxy (2020 Jan 25)
- Replies: 26
- Views: 11008
Re: APOD: Rubin's Galaxy (2020 Jan 25)
C = r(squared) x pi C = πD. If it is 800,000 ly across (which I'm doubtful is accurate) its circumference is about 2.4 million ly. The formula you give is for area (although the meaning of area is a bit ambiguous for something which is shaped like a combination of a spheroid and a disc). And that a...