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Asteroids - NASA Science
Asteroid - Wikipedia
Asteroid | Definition, Size, & Facts | Britannica
Asteroid that passes nearby could hit Earth in the future, NASA says
What Is an Asteroid? | NASA Space Place – NASA Science for Kids
Asteroids: Facts - NASA Science
In Depth | Asteroids – NASA Solar System Exploration
Asteroid Watch - NASA Jet Propulsion Laboratory (JPL)
Asteroid Fast Facts - NASA
Asteroids, Comets & Meteors - NASA Science