Astronomy Lessons

Part C: Why One Side Always Faces Us

Only one side of the Moon ever faces us because Earth's force of gravity on it is not uniform. This is related to our ocean tides and a lengthening of days on Earth. Duration: 7:58.

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Part A: An Introduction to our Sun

Part A: A Quick Tour of the Planets

Part C: Speed of Light and the Light-Year

Part D: Planet Mars

Gravity Due to Acceleration

Part A: Black Hole Formation

The Hertzsprung-Russell Diagram

Novae and Supernovae

Introduction to Cosmic Inflation

Part C: Why One Side Always Faces Us

Part C: Saturn's Rings

Types of Galaxies

Stellar Luminosity and Color

Part D: Eclipses

Part A: Asteroids and Meteors

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