The galaxy is littered with planetary systems vastly different from ours. In the solar system, the planet closest to the Sun--Mercury, with an orbit of 88 days--is also the smallest. But NASA's Kepler spacecraft has discovered thousands of systems full of very large planets--called super-Earths--in very small orbits that zip around their host star several times every 10 days.
Gravitational forces in protoplanetary disks may push super-Earths close to their stars
Phys.org - 9 May 2019 21:29
The galaxy is littered with planetary systems vastly different from ours. In the solar system, the planet closest to the Sun--Mercury, with an orbit of 88 days--is also the smallest. But NASA's Kepler spacecraft has discovered thousands of systems full of very large planets--called super-Earths--in very small orbits that zip around their host star several times every 10 days.
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