You can tell (or deduce I guess)
a whole lot from the light spectrum of a star, it's relative brightness, how far away it is, and what else is nearby.
That withstanding, it's still completely mid boggling that they can do it anyway.
(
LemonEntryMyDearWatson This time, Moriarty, the hand is on the other foot, Mon 1 Dec 2008, 11:59,
Reply)