Chapter 13: Gravitational Interactions

WEIGHT AND WEIGHTLESSNESS

Biophysics in Microgravity
Find out how proteins grow in outer space or how cells react to microgravity at this site sponsored by the Marshall Space Flight Center.

OCEAN TIDES

Lunar Tides
Learn more about tides in this page from The Solar System, an online astronomy course at the University of Tennessee.

Lunar Eclipse Animation
Watch as the moon passes through the umbra of the earth's shadow in this animation from The Solar System, an online astronomy course at the University of Tennessee.

Solar Eclipse
This Exploratorium online exhibition features personal accounts, images, and video footage of the total solar eclipse that occurred across the southern Caribbean on February 26, 1998.

Solar Eclipses
Learn all about solar eclipses in this page from The Solar System, an online astronomy course at the University of Tennessee. Be sure to check out the solar eclipse animation.

Sun and Moon Eclipses
Provided by the U.S. Naval Observatory, this site lists the time and location of all upcoming solar and lunar eclipses.

TIDES IN THE EARTH AND ATMOSPHERE

Tides and Gravitational Locking
Did you know that tidal forces produce earth tides as well as ocean tides? Earth tides occur as distortions, or bulges, in the body of the earth. Learn more by reading this page from The Solar System, an online astronomy course at the University of Tennessee.

BLACK HOLES

The Black Hole FAQ
Provided by Ted Bunn of the Center for Particle Astrophysics, this site answers a multitude of frequently asked questions concerning black holes.

Virtual Trip to Black Holes
Read the article by Robert Nemiroff entitled "Visual Distortions Near a Black Hole and Neutron Star," then view the videos of virtual trips to black holes and neutron stars.

Unit 1: Learning Links
Chapter 1, Chapter 2, Chapter 3, Chapter 4, Chapter 5, Chapter 6
Chapter 7, Chapter 8, Chapter 9, Chapter 10, Chapter 11
Chapter 12, Chapter 13, Chapter 14, Chapter 15, Chapter 16