The dark region seen on the face of the sun at the end of March 2013 is a coronal hole (just above and to the right of the middle of the picture), which is a source of fast solar wind leaving the sun in this image from NASA's Solar Dynamic Observatory.
Mission: Rosetta Size: 718 x 476
Electronics for a Spectrometer
NASA has provided part of the electronics package for an instrument called the Double Focusing Mass Spectrometer, which is part of the Swiss-built Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) instrument.
Three of NASA's contributions to the ESA's Rosetta mission are pictured here: an ultraviolet spectrometer called Alice (top), the Ion and Electron Sensor (IES) (bottom left), and the Microwave Instrument for Rosetta Orbiter (MIRO) (bottom right).
NASA's Cassini spacecraft captures a still and partially sunlit Enceladus. The Saturnian moon is covered in ice that reflects sunlight similar to freshly fallen snow, making Enceladus one of the most reflective objects in the solar system.
Using a special spectral filter, NASA's Cassini spacecraft was able to peer through the hazy atmosphere of Saturn's moon Titan. This image features the largest seas and some of the many hydrocarbon lakes that are present on Titan's surface.
NASA's NEOWISE spacecraft opened its 'eyes' after more than two years of slumber to see the starry sky with the same clarity achieved during its prime mission. This image shows a patch of sky in the constellation Pisces.
Late night in the desert: Goldstone's 230-foot (70-meter) antenna tracks spacecraft day and night. This photograph was taken on Jan. 11, 2012. The Goldstone Deep Space Communications Complex is located in the Mojave Desert in California, USA.
This colorful composite image from NASA's Dawn mission shows the flow of material inside and outside a crater called Aelia on the giant asteroid Vesta. To the naked eye, these structures would not be seen. But here, they stand out in blue and red.
A dying star, called the Helix nebula, is shown surrounded by the tracks of asteroids in an image captured by NASA's WISE. Skirting around the edges of the Helix nebula are the footprints of asteroids marching across the field of view.
This frame from a colorized flyover movie from NASA's Cassini mission shows the two largest seas on Saturn's moon Titan and nearby lakes. The liquid in Titan's lakes and seas is mostly methane and ethane.
This graphic shows the location of water vapor detected over Europa's south pole in observations taken by NASA's Hubble Space Telescope in December 2012. This is the first strong evidence of water plumes erupting off Europa's surface.