9 May
2014
9 May
'14
10:12 a.m.
Well, since the early 1900's, at least, when Plaskett developed the modern diffraction grating. On Fri, May 9, 2014 at 9:55 AM, Ann House <ann@annhouse.org> wrote:
http://newsoffice.mit.edu/2014/wimpy-dwarf-fossil-galaxy-reveals-new-facts-a...
I'm amazed that we can determine the chemical make-up of stars so far away. It must be an exciting time to be an astronomer!