Astronomy and Cosmology
Topics related to observation of space and any related phenomena.
3685 topics in this forum
-
- 78 replies
- 4.5k views
-
- 0 replies
- 148 views
-
- 9 replies
- 413 views
-
- 3 replies
- 319 views
-
Is the universe at least 136 billion years old, is the universe not expanding at all, did the universe begin its expansion when Hubble measured its redshift for the first time or was light twice as fast 13.5 billion years ago than it is today? 1 2 3 4 8
- 187 replies
- 8k views
-
- 0 replies
- 352 views
-
- 1 reply
- 175 views
-
- 0 replies
- 166 views
-
- 2 replies
- 356 views
-
- 42 replies
- 1.7k views
-
- 2 replies
- 396 views
-
- 7 replies
- 356 views
-
- 27 replies
- 1.4k views
-
- 5 replies
- 449 views
-
- 19 replies
- 781 views
-
- 7 replies
- 675 views
-
- 1 reply
- 339 views
-
- 17 replies
- 548 views
-
- 11 replies
- 628 views
-
- 6 replies
- 510 views
-
- 11 replies
- 783 views
-
- 3 replies
- 313 views
-
- 6 replies
- 918 views
-
- 20 replies
- 1.1k views
-
- 2 replies
- 414 views