First Stars - And then there was light
In this picture I have tried to convey a sense of emptiness where the early universe was punctuated only by giant blue stars. The first stars are believed to have been extremely massive - as many as 150 suns. Their light ended the Dark Ages. Just one or two per protogalaxy would have been energetic enough to cause profound changes in their environments, paving the way for 'normal' stars like our Sun to form. The First Stars ran out of fuel very quickly, possibly within a million years.