Cosmic Rays Differ from Other Forms of Interstellar Matter by

Multiple Choice

Cosmic rays differ from other forms of interstellar matter by

A) moving much faster, at typical speeds of 90% the speed of light
B) being made of hydrogen atoms
C) absorbing all the light that falls on them
D) having nothing to do with stars at any point in their "lives"
E) coming only from outside the Milky Way Galaxy