This artist's concept depicts red dwarf KOI-961 and its three planets, which are all smaller than Earth. The smallest of the three planets (pictured here in the foreground), called KOI-961.03, is about the size of Mars and is located the farthest from the star. The planet in the upper right is KOI-961.01, 0.78 times the radius of Earth. The planet closest to the star is KOI-961.02, with a radius 0.73 times Earth's.