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Halley's Appearance: Speculation and Data

Related Article: Learn more about comets.

For centuries, comets have been depicted in paintings as important symbols.
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Shape of the Universe

Shape of the Universe (2:34)

Learn about the forms and contours of the universe.

How Stars are Born and Die

How Stars are Born and Die (5:24)

Watch this NASA "Hidden Universe" video showing how stars are born and how stars die. Learn how the Spitzer Space Telescope is able to use infra-red technology to see far into distant galaxies.

Big Bang Discovery

Big Bang Discovery (2:10)

Learn how we discovered the expanding universe and its origin in the Big Bang. Learn more about the Big Bang in this video.

Could a Black Hole Destroy the Earth?

Could a Black Hole Destroy the Earth? (2:08)

Some black holes move from place to place, and one could destroy earth. Learn more about black holes in this HowStuffWorks video.

The Planets: Asteroids

The Planets: Asteroids (2:48)

The NEAR probe surveys the asteroid Eros and provides the first hard data about these mysterious bodies. Learn more about asteroids in this video.

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Giants - Outer Planet Probe

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.

Astronomy

Astronomy (3:46)

Scientists believe that the universe is not only still expanding from the Big Bang – it is also accelerating.

Big Bang Discovery

Big Bang Discovery (2:10)

Learn how we discovered the expanding universe and its origin in the Big Bang. Learn more about the Big Bang in this video.

Discoveries: Cosmic Rays

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.

The Shape of the Universe

The Shape of the Universe (2:34)

The universe is a complicated place with intricate forms and contours. Learn more about the shape of the universe in this video.

Cosmos: Galaxy

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

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.

The Planets: Asteroids

The Planets: Asteroids (2:48)

The NEAR probe surveys the asteroid Eros and provides the first hard data about these mysterious bodies. Learn more about asteroids in this video.

How Asteroid Impacts Work

How Asteroid Impacts Work (1:46)

A large asteroid could end life on earth. Learn more about asteroid impacts in this HowStuffWorks video.

Could Antimatter Destroy the Earth?

Could Antimatter Destroy the Earth? (1:46)

A collision with antimatter could destroy life on planet earth. Learn more about antimatter in this HowStuffWorks video.