Introduction To - Cosmology

An invisible form of matter that does not emit light but exerts gravitational pull, holding galaxies together.

A repulsive force that appears to be accelerating the expansion of the universe, pushing galaxies apart at an increasing rate. 4. The Fate of the Universe Introduction to Cosmology

If the universe is expanding today, it must have been smaller and denser in the past. The suggests that approximately 13.8 billion years ago, the entire observable universe was concentrated in a state of infinite density and heat called a singularity. An invisible form of matter that does not