Fragile orbits of seven exoplanets could survive only limited early bombardment — ScienceDaily

Seven Earth-sized planets orbit the star TRAPPIST-1 in near-perfect harmony, and US and European researchers have used that harmony to determine how much physical abuse the planets could have withstood in their infancy. “After rocky planets form, things bash into them,” said astrophysicist Sean Raymond of the University of Bordeaux in France. “It’s called bombardment, … Read more