beginnings and endings
Monday, November 30, 2009 - 16:35
in Astronomy & Space
1. dark matter: the force that holds stars in the sky. it can be proven in several ways: dark matter neither absorbs or emits light, scientist can observe it by measuring the effects of its gravity. this can be easily seen when two galaxies collide. Scientist use special telescopes to detect the location and amount of mass during the collision.