7 Earth-Sized Planets Found Orbiting a Tiny Star

(Credit: NASA/JPL-Caltech)TRAPPIST-1 has a solar system like no other. The tiny, tiny red dwarf is just barely big enough to be considered a star, and is, radius-wise, a hair bigger than Jupiter. When it was announced last May, there was some excitement: the system had three Earth-sized planets, and they might all be habitable.