I. The Nature of the Universe

A. Stars are extremely complex and improbable arrangements of matter 1. Gas naturally diffuses 2. Stars are highly condensed forms of matter at high temperatures Starlight and the Age of the Universe Supplemental Reading Evidence for a Young Sun Supplemental Reading The Sun Is Shrinking Supplemental Reading

B. Galaxies consist of about 100 billion stars. There are at least 100 billion galaxies.

C. Our Solar System