Astronomers have discovered a massive exoplanet orbiting Gliese 3512 (GJ 3512), an M-dwarf star (red dwarf) located 31 light-years away. Dubbed Gliese 3512b, the planet has a mass of 0.46 Jupiter masses, very high for such a small host star, and an eccentric 204-day orbit. Using simulations, the researchers have also demonstrated that the Gliese 3512 planetary system challenges generally accepted theories of planet formation. M-dwarf stars are low-mass stars that emit most of their faint light in the near-infrared. They the most common type of star in the Milky Way. However, despite their ubiquity, only about 10% of nearly...