WASHINGTON—Barnard’s star is a red dwarf, the smallest type of regular star and much smaller and less luminous than our sun. At about 6 light years away, it is the closest single star—one not orbiting with other stars—to our solar system. It is, in cosmic terms, in our neighborhood.
Because of this, scientists eager to study nearby potentially habitable worlds are excited by the discovery of the first confirmed planet orbiting Barnard’s star, a rocky one with a mass about 40 percent that of Earth.
