21.   The survey also showed that star formation seemed to peak seven billion to nine billion years ago, consistent with earlier studies of the composition of the intergalactic medium.

22.   The study will permit astronomers to determine how such collisions have affected star formation.

23.   Theorists, he said, will now have to refine or recast their ideas of star formation.

24.   They already understood the initial stage of star formation.

25.   They said the research could help assess theories of star formation and evolution, one of the important questions of cosmology.

26.   To answer this question, scientists first needed to understand precisely where the old infall model of star formation needed fixing.

27.   Its observations found that their brightness is a result of star formation.

28.   Prosecutor Jean-Louis Loran said the bodies, legs splayed, feet toward the fire, were lying in a star formation.

29.   Richer said it is estimated that star formation did not begin until about a billion years after the Big Bang.

30.   The collisions create dense dust clouds that trigger star formations, but the clouds are so opaque that the Hubble is blind to them.