Scientists say a “fake moon” has been following the Earth in its orbit around the Sun for over 2,000 years.
The small asteroid was discovered in March at an observatory in Hawaii, and is estimated to be about 50 feet in diameter. Scientists are calling it a "quasi-moon" because it orbits the Sun in a similar time frame as the Earth, though it's roughly nine-million miles away.
Some are estimating it's been following the Earth since about 100 BC, which would make it the longest quasi-satellite of Earth known to date. Typically, fake moons only tailgate Earth for a decade or two.