“Where are you going now, my love?
Where will you be tomorrow?
Will you bring me happiness?
Will you bring me sorrow?” -Stephen Stills / Crosby, Stills & Nash
By See Noevo (not verified) on 30 Aug 2016 #permalink
“The most exciting part, from a cosmology point of view, is that the first true galaxy clusters will only form at this particular juncture in the game between two and three billion years of age if the Universe is dominated by dark matter… If we hadn’t discovered clusters forming this early, it would’ve posed some big trouble for dark matter; similarly, if we find them when the Universe is only 1 billion years old…that will spell trouble for dark matter, too. Instead, we’re seeing these cosmic behemoths forming exactly where and when they should.”