You need the Flash Player version 8.0.0.0 or higher and a JavaScript enabled browser to view this site

Giants - Outer Planet Probe

Related Article: Learn more about the Voyager spacecraft.

Scientists' long-held dream of a satellite space flight to the outer planets came to fruition during a rare planetary alignment in 1977.

browse videos in astronomy

Shape of the Universe (2:34)

Learn about the forms and contours of the universe.

Giants - Outer Planet Probe (3:34)

Scientists' long-held dream of a satellite space flight to the outer planets came to fruition during a rare planetary alignment in 1977.

Discoveries: Cosmic Rays (6:21)

Scientists are determined to find out where cosmic rays come from, so they're building a huge cosmic ray-catching net. Learn more about fishing for rays in this video.

Cosmos: Galaxy (2:32)

Carl Sagan journeys to a time when galaxies were beginning to form. Learn more about our cosmos in this video from Discovery.

100 Greatest Discoveries: Astronomy (3:46)

Scientists belive that the universe is not only expanding from the Big Bang, but also accelerating. Learn more about astronomy in this video from Discovery.

recently added

Science Investigations: Investigating Astronomy (3:21)

Learn more about investigating astronomy in this video.

Spin Around the Solar System: Quiz on the Stars (3:45)

Find out how much you've learned about the stars by taking this video quiz.

Spin Around the Solar System: Dying Stars (2:22)

When a star runs out of fuel, it may take one of several paths to “death.” A dwarf star is very small. The most massive stars can collapse to form black holes. Some stars explode, creating novas or supernovas.

Spin Around the Solar System: How Stars Form (2:44)

Stars form when gravity causes material in a nebula to condense into a large sphere. When enough material has been accreted, the pressure inside the sphere is great enough to cause hydrogen atoms to fuse into helium and release immense amounts of... More »

Spin Around the Solar System: Beyond the Milky Way (3:19)

More galaxies lie outside the Milky Way; most can only be seen by telescopes. Because many of the galaxies are far away, light takes a long time to travel to us and can act as a “time machine.”

Spin Around the Solar System: Interstellar Filler (1:58)

The interstellar medium is very sparse. Places where more matter is gathered together are called nebulas. Space also contains energy in the form of cosmic rays, radio waves, X-rays, light and heat.

Spin Around the Solar System: Where in the World We Are (2:23)

Earth is the third planet from the sun. The solar system is located in the Orion Arm of the Milky Way galaxy.

Spin Around the Solar System: Starry Starry Night (1:16)

People have been asking questions about the stars throughout history. Many stars seem to form shapes in the sky, which are called constellations.

Investigating Astronomy: Neutron Stars and Black Holes (8:37)

Take a look at this video to learn more about the enigmatic nature of neutron stars and black holes.

Investigating Astronomy: Mars (7:41)

Check out this video for a close-up look at the planet Mars.