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asteroids

What Are Asteroids?
 

What Are Asteroids?

Along with stars and planets, space also has billions of rocks. Some of these asteroids are as small as grains of sand. Others, like Quaoar, are 1/10th the size of Earth. Because of their small size, asteroids don't have enough gravity to pull themselves into the shape of a ball.

Explore the different types of asteroids, the inner and outer asteroid belts, and where all those rocks came from.

KidsAstronomy.com
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How Paintballs Could Save Earth from Giant Asteroid Impact

How Paintballs Could Save Earth from Giant Asteroid Impact

An epic battle between paintballs and a giant asteroid could one day save the Earth… That's the idea behind this MIT graduate student's asteroid-deflecting scheme. Could it work? More...

Article
Space.com
The Asteroid that Hit L.A.

The Asteroid that Hit L.A.

If the asteroid Apophis were to strike Los Angeles, how far away would the catastrophe ripple? Check out a few hair-raising scenarios. More...

Interactive
NOVA/PBS
What If an Asteroid or Comet Hits My Town?

What If an Asteroid or Comet Hits My Town?

If you've ever wondered what the answer to that question is, then you should definitely give this a try. Go ahead. Drop a rock on someone! More...

Interactive
Space Science Institute
Asteroid

Asteroid

A rock bigger than the Rose Bowl is hurtling towards Earth. If the Apophis asteroid hit our planet, it would release the energy of 100 nuclear bombs. How big is the threat? Watch now. More...

Video
NOVA/PBS
Deflect an Asteroid

Deflect an Asteroid

An asteroid is on a crash course with Earth. Your mission? Try to deflect it with bombs, rockets, or impactors. Don't delay — the clock is ticking! More...

Game
Space Science Institute
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What If an Asteroid Hit the Earth?

What If an Asteroid Hit the Earth?

Movies and science fiction have long been fascinated with the idea of an asteroid hitting Earth. But what would it really mean? Find out. More...

Article
Discovery
Asteroids and Comets

Asteroids and Comets

Asteroids and comets are rocky remnants from the solar system's creation 4.5 billion years ago. Explore notable asteroids and comets — and the difference between these two kinds of cosmic rocks. More...

Article
National Geographic
Diamonds in the Sky

Diamonds in the Sky

Science has turned up very tiny diamonds driven to Earth from deep space in meteorites. Neptune and Uranus may create diamond rainstorms. Get the details. More...

Article
NOVA/PBS
NASA Offers $35,000 for Help in Tracking Asteroids

NASA Offers $35,000 for Help in Tracking Asteroids

Sure, scientists have found 95% of the large asteroids near Earth's orbit, but what about that other dangerous 5%? NASA is seeking the help of coders with a big citizen science contest. More...

Article
NPR
Siberian Blast

Siberian Blast

In 1908, an asteroid or comet leveled 800 square miles of Siberian forest. Watch a simulation of the cataclysmic power and shock wave of the strike. More...

Interactive
National Geographic
Asteroid Facts

Asteroid Facts

Who discovered the first asteroid? What's a planetoid? And where is the asteroid belt located? Get these answers and more. More...

Article
Science Kids
Asteroids: Formation, Discovery, and Exploration

Asteroids: Formation, Discovery, and Exploration

Done scratching the surface? Take an in-depth look at how asteroids are classified, what they are made of, and how scientists get close-up images. More...

Article
Space.com

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