A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

Type to find tags:
created Sep 19 at 13:29
created Sep 18 at 13:52
created Sep 17 at 1:21
created Sep 16 at 2:44
a star with an enormous mass and luminosity, showing signs of a very high rate of mass loss.
created Sep 15 at 15:44
× 2
created Sep 9 at 13:44
created Sep 9 at 13:44
created Sep 7 at 11:54
× 8
Questions regarding gravitationally bound systems of hundreds to thousands of galaxies as well as interactions between such systems.
created Sep 2 at 19:39
created Sep 2 at 13:51