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All About Astronomy
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Asteroid 253 Mathilde, a Near-Earth Asteroid photographed by NASA's NEAR (Near Earth Asteroid Rendezvous) mission in June 1997. Mathilde is about 60 km in diameter and orbits in the asteroid belt between Mars and Jupiter.
Gaspra, Asteroid #951.
Asteroid 4 Vesta, the brightest asteroid and the fourth largest. Vesta is the only asteroid that can be seen without a telescope (it is sixth magnitude).
The asteroid 243 Ida and its tiny asteroid moon, Dactyl. This is the first asteroid ever found with an orbiting moon. Ida's dimensions are about 56 x 24 x 21 kilometers (35 x 15 x 13 miles). Dactyl is only about 1.2 x 1.4 x 1.6 km (0.75 x 0.87 x 1 mile) across.
Trojan asteroids are asteroids that orbit in gravitationally stable Lagrange points in a planet's orbit, either trailing it or preceding it (these places are where the gravitational attraction of the Sun and of the planet balance each other). Jupiter has the most Trojan asteroids; Mars also has some. Achilles was the first Trojan asteroid found. The asteroids preceding Jupiter in its orbit were named for Greek heroes; those following Jupiter in its orbit were named for Trojan heroes.
Asteroid coloring page
A quiz about asteroids
An interactive puzzle about asteroids
Asteroids Cloze: A fill-in-the-blanks activity on asteroids. Answers
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