The Juno spacecraft launched aboard an Atlas V rocket from Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida on Friday, Aug. 5, 2011. Juno will make a five-year, 400-million-mile voyage to Jupiter, orbit the planet, investigate its origins and evolution with eight instruments to probe its internal structure and gravity field, measure water and ammonia in its atmosphere, map its powerful magnetic field and observe its intense auroras. Image Credit: NASA/Bill Ingalls

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On Sunday, July 31, 2011, when Expedition 28 astronaut Ron Garan aboard the International Space Station looked out his window, this is what he saw: the moon. And, he saw it 16 times. Said Garan, "We had simultaneous sunsets and moonsets." For Garan and the rest of the station crew, this extraordinary event is a daily occurrence. Since the station orbits the Earth every 90 minutes, each day the crew experiences this about 16 times a day. Image Credit: NASA

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Our ability to fly at supersonic speeds over land in civil aircraft depends on our ability to reduce the level of sonic booms. NASA has been exploring a variety of options for quieting the boom, starting with design concepts and moving through wind tunnel tests to flight tests of new technologies. This rendering of a possible future civil supersonic transport shows a vehicle that is shaped to reduce the sonic shockwave signature and also to reduce drag. Image credit: NASA/Lockheed Martin

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Apollo 15 lunar module pilot Jim Irwin loaded the lunar rover with tools and equipment in preparation for the first lunar spacewalk at the Hadley-Apennine landing site. The Lunar Module 'Falcon' appears on the left in this image. The undeployed Laser Ranging Retro-Reflector lies atop Falcon's Modular Equipment Stowage Assembly. Apollo 15 launched 40 years ago today on July 26, 1971, from Launch Pad 39A at the Kennedy Space Center. Image Credit: NASA

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