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Earth has two other co-orbital satellites besides the Moon: asteroids 3753 Cruithne and 2002 AA29. Cruithne is 3 miles wide and orbits in synchrony with Earth, while AA29 is smaller and orbits in a horseshoe shape. The Earth is not a perfect sphere and may have had a second moon in the past.
Earth’s best-known co-orbital satellite, or object that shares Earth’s orbit, is the Moon, but scientists believe Earth has two other co-orbital satellites: the asteroids known as 3753 Cruithne and 2002 AA29. The asteroid known as 3753 Cruithne, sometimes referred to as Earth’s second moon, is more than 3 miles (5 km) wide and orbits in synchrony with Earth. Earth’s other co-orbital satellite, 2002 AA29, is much smaller at just 196 feet (60 m) in diameter and orbits the Earth in a horseshoe shape. Scientists estimate that this smallest co-orbital satellite approaches Earth every 95 years.
More about Earth:
The Earth is actually not a perfect sphere. The distance between the north and south poles is about 26 miles (43 km) less than the diameter of the Earth at the equator.
About 70% of the Earth is covered by oceans. The other parts are solid ground above sea level.
Scientists believe there may have been a second moon in the past, as evidenced by soil on the side of the moon that they theorize may have come from another moon that crashed into it.
