Homework Help: Science 3

Posted by Liz on Tuesday, November 7, 2006 at 9:19pm.

Which of these is NOT a source of the shock waves that lead to protostars?

A. radiation from the OB stars in emission nebulae
B. expanding Herbig-Haro objects
C. expanding planetary nebula shells
D. violent supernovae explosions
E. collisions between galaxies

MUMBO JUMBO

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