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LET'S EXPLORE Space

Space glossary

A

Aphelion The point in an object’s orbit when it is farthest away from the Sun.

Asteroid  A rocky body that orbits the Sun. Asteroids range in size from tiny specks to blocks about 1000 km (600 miles) in diameter. The region between Mars and Jupiter where most of the known asteroids in the Solar System lie is called the Asteroid Belt. 

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