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Earth's second moon

Earth's Second Moon, 3753 Cruithne

Everyone knows and loves the moon.  What you may not know is that it's not Earth's only natural satellite.  In 1997, another body was discovered, 3753 Cruithne, also called a quasi-orbital satellite of Earth.  This means that Cruithne doesn't orbit Earth in a nice ellipse the same way our moon does.  Instead, Cruithne scuttles around the inner solar system in what's called a horseshoe orbit.
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