Amor asteroids vary widely in composition, which indicates they have come from different parts of the main asteroid belt and have been perturbed into their present orbits by either Jupiter or Mars. Close approaches to Earth and Mars can further alter their paths so that they temporarily become Earth-crossing Apollo group asteroids. About one in ten Amors will cross Earth's orbit in the course of a few hundred to a few thousand years.
Related category• ASTEROIDS AND OTHER MINOR PLANETS: TYPES AND GROUPS
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