 This web-near-infrared camera image shows the central portion of the star cluster IC-348. Astronomers found three brown dwarfs that are less than eight times the mass of Jupiter. Brown dwarfs are objects that straddle the dividing line between stars and planets. They form like stars, growing dense enough to collapse under their own gravity. But they never become dense and hot enough to begin fusing hydrogen and turn into a star. At the low end of the scale some brown dwarfs are comparable with giant planets weighing just a few times the mass of Jupiter. Here they are circled in the main image and shown in the detailed pull-outs. The smallest weighs just three to four times Jupiter.