This artist's concept shows the smallest star known to host a planet. The planet, called VB 10b, was discovered using astrometry, a method in which the wobble induced by a planet on its star is measured precisely on the sky. The dim red star, called VB 10, is a so-called M-dwarf, located 20 light-years away in the constellation Aquila. It has only one-twelfth the mass, and one-tenth the size, of our Sun. The planet is a gas giant similar in size to Jupiter but with 6 times the mass. Although the planet is less massive than its star, the two orbs would have a similar diameter. VB 10b orbits its star about every 9 months at a distance of 30 million miles (50 million kilometers).