An artist's rendering of Kepler-186f, the first validated Earth-size planet to orbit in the habitable zone of a distant star. T. Pyle/NASA/SETI Institute/JPL-Caltech hide caption

itoggle caption T. Pyle/NASA/SETI Institute/JPL-Caltech

This diagram for the outer solar system shows the orbits of Sedna (in orange) and 2012 VP113 (in red). The sun and terrestrial planets are at the center, surrounded by the orbits (in purple) of the four giant planets — Jupiter, Saturn, Uranus and Neptune. The Kuiper belt, which includes Pluto, is shown by the dotted light blue region. Scott S. Sheppard/Carnegie Institution for Science hide caption

itoggle caption Scott S. Sheppard/Carnegie Institution for Science

The Chinese flag is seen in front of a view of the moon at Beijing's Tiananmen Square in December, when China's first moon rover touched the lunar surface. That feat was widely celebrated — but observers believe the rover has now run into serious trouble. Mark Ralston/AFP/Getty Images hide caption

itoggle caption Mark Ralston/AFP/Getty Images

This composite image shows new details of the aftermath of a massive star that exploded and was visible from Earth over 1,000 years ago. Chandra X-ray Observatory Center/NASA hide caption

itoggle caption Chandra X-ray Observatory Center/NASA

Live, from the moon, it's the space weather report: Data from a lunar orbiter is being used to create a music stream that reflects conditions in space. Here, an image created by NASA "visualizers" who used data from 2010 to show the moon traveling across the sun, as happens two or three times a year. NASA/SDO/LRO/GSFC hide caption

itoggle caption NASA/SDO/LRO/GSFC