The archives of Space.com have produced an old but strikingly weird story about a strikingly weird discovery – a second moon orbiting invisibly around Earth:

The 3-mile-wide (5-km) satellite, which takes 770 years to complete a horseshoe-shaped orbit around Earth, is called Cruithne and will remain in a suspended state around Earth for at least 5,000 years.

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There are almost [...]