JOE TUCCIARONE / SCIENCE PHOTO LIBRARY JOE TUCCIARONE / SCIENCE PHOTO LIBRARY
Animation of a heavy meteorite bombardment of an alien planet and its moons. The surface of the planet is heavily cratered with numerous molten regions. This echoes the Late Heavy Bombardment of Earth and the Moon early in their history, some four billion years ago. Such a process could occur in any planets that formed in a similar way. In July 2017, researchers announced the potential discovery of the first exomoon, a natural satellite of a planet around another star. The system orbits the Sun-like star Kepler 1625, some 4000 light years from Earth.
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