Earth will have a visitor within its orbit for the next several decades, according to astronomers. An asteroid named 2025 PN7 has become a "quasi-moon" to Earth, as it will be sharing an orbit with our planet until 2083, according to a paper published last month in IOP Science . Quasi-moons are not real moons and don't actually orbit the Earth, although they sometimes appear to do so for short periods of time, Phil Nicholson, professor of astronomy at Cornell University, told ABC News. Instead, they orbit the sun -- like typical asteroids -- on paths that are "very similar" to Earth's. "As a result, they sometimes 'keep company' with the Earth for years, or even decades," Nicholson said. "Think of a wolf that follows the camp of a band of prehistoric hunters, looking for scraps, but doesn’

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