ChatterBank6 mins ago
Cruithne
Anybody know anything about what has been called "Earth's second Moon"?
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For more on marking an answer as the "Best Answer", please visit our FAQ.It is the 5km wide Asteroid 3753. It is locked into a 1:1 resonance with Earth which means it orbits the Sun in the same time the Earth orbits the Sun (I think) but on a different path. The nearest it comes to the Earth is 1 Astronomical Unit (40 moon lengths). There are another two asteroids also in 1:1 resonance with the Earth.