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Wednesday, October 23, 2002

Earth's little brother found

Astronomers have discovered the first object ever that is in a companion orbit to the Earth.
Asteroid 2002 AA29 is only about 100 metres wide and never comes closer than 3.6 million miles to our planet.
But it shares the Earth's orbit around the Sun, at first on one side of the Earth and then escaping to travel along our planet's path around the Sun until it encounters the Earth from the other side. Then it goes back again.
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