Although Mimas and Pandora, shown here, both orbit Saturn, they are very different moons.
NASA astronaut Scott Kelly captured this photograph from the International Space Station on Oct. 7, 2015. Sharing with his social media followers, Kelly wrote, "The daily morning dose of #aurora to help wake you up. #GoodMorning from @Space_Station! #YearInSpace"
Pluto’s haze layer shows its blue color in this picture taken by the New Horizons Ralph/Multispectral Visible Imaging Camera (MVIC). The high-altitude haze is thought to be similar in nature to that seen at Saturn’s moon Titan. This image was generated by software that combines information from blue, red and near-infrared images.
The High Resolution Imaging Science Experiment (HiRISE) camera aboard NASA's Mars Reconnaissance Orbiter often takes images of Martian sand dunes to study the mobile soils. These images provide information about erosion and movement of surface material, about wind and weather patterns, even about the soil grains and grain sizes.
As NASA missions to Mars progress with science and complex human exploration missions, spacecraft will require larger heat shields to protect against the extreme heat of entering a planet's atmosphere and decelerating at a safe altitude in the thin Martian atmosphere.
The Space Shuttle Challenger launches from Florida at dawn. On this mission, Kathryn Sullivan became the first U.S. woman to perform a spacewalk and Marc Garneau became the first Canadian in space. The crew of seven was the largest to fly on a spacecraft at that time, and STS-41G was the first flight to include two female astronauts.
NASA Astronaut Scott Kelly captured this photo on Oct. 2, 2015, from the International Space Station and wrote on Twitter, "Early morning shot of Hurricane #Joaquin from @space_station before reaching #Bahamas. Hope all is safe. #YearInSpace."