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Space Rocks
Little chunks of rock and debris in space are called meteoroids. They become meteors -- or shooting stars -- when they fall through a planet's atmosphere; leaving a bright trail as they are heated to incandescence by the friction of the atmosphere. Pieces that survive the journey and hit the ground are called meteorites.

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Perseid Fireballs
Perseid Fireballs
Noctilucent Clouds Get an Early Start
Noctilucent Clouds Get an Early Start
Dr. Jim Green Discusses NEOs
Dr. Jim Green Discusses NEOs
ScienceCasts: What Exploded Over Russia?
ScienceCasts: What Exploded Over Russia?
DNA Building Blocks Can Be Made in Space
DNA Building Blocks Can Be Made in Space
NASA ScienceCast: Meteors from Halley's Comet
NASA ScienceCast: Meteors from Halley's Comet
Perseid Fireballs
Perseid Fireballs
Noctilucent Clouds Get an Early Start
Noctilucent Clouds Get an Early Start
Dr. Jim Green Discusses NEOs
Dr. Jim Green Discusses NEOs
ScienceCasts: What Exploded Over Russia?
ScienceCasts: What Exploded Over Russia?
DNA Building Blocks Can Be Made in Space
DNA Building Blocks Can Be Made in Space
NASA ScienceCast: Meteors from Halley's Comet
NASA ScienceCast: Meteors from Halley's Comet