User talk:2600:1700:7720:7E20:B1D3:9C4D:E231:F5C

Incorrect visual diameter?
The second paragraph of the entry for the Milky Way (our home galaxy) states that the visual diameter is approximately 1.9 million light years. I have seen it stated in textbooks that the diameter is only ~300 kiloparsecs. It seems to me that the stated diameter is off by at least a factor of 10. Either that, or the textbooks are way off. Perhaps the author meant the diameter of the dark matter halo. Reference: Eric Chaisson and Steve McMillan, 2008, Astronomy Today, Sixth Edition, Ch.4, Pearson/Addison-Wesley 2600:1700:7720:7E20:B1D3:9C4D:E231:F5C (talk) 05:08, 9 December 2020 (UTC)