Asteroids are small Solar System bodies or dwarf planets that are not comets. They have also been called planetoids, especially the larger ones.
The first radar images of asteroid 1998 QE2 were obtained when the asteroid was about 3.75 million miles (6 million kilometers) from Earth, as pictured in this image courtesy of NASA. The small white dot at lower right is the moon, or satellite, orbiting asteroid 1998 QE2. A large asteroid accompanied by its own small moon was approaching Earth on May 31, 2013, the latest in a string of celestial visitors drawing attention to the potential dangers of objects in space.
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