A concept image of a spacecraft powered by a fusion-driven rocket. In this image, the crew would be in the forward-most chamber. Solar panels on the sides would collect energy to initiate the process that creates fusion.
NASA's Cassini spacecraft revealed this view of the Saturn with its main rings. The planet glows in natural color, as human eyes would see it. 36 images in three color filters combine in this mosaic, obtained by Cassini's imaging science subsystem on Oct. 10, 2013.
Comet ISON comes in from the bottom right and moves out toward the upper right, getting fainter and fainter, in this time-lapse image from the ESA/NASA Solar and Heliospheric Observatory on Nov. 28, 2013. The image of the sun at the center is from NASA's Solar Dynamics Observatory.