... Brown Dwarf Gliese 229B . ... The spot near the bottom is an image of an unusual type of object: a brown dwarf. A brown dwarf is sometimes called a "failed star" because it does not have enough mass to shine by nuclear fusion. A Chamaeleon Sky . ... Where do stars form in galaxies? ... Aurora and Orion . ... Mapping Mars . ... Happy Face Crater on Mars . ... Even Mars can put on a happy face. The Martian crater Galle has internal markings reminiscent of a smiley face symbol. ...