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The lifecycle of a G-type star, like the Sun. All original videos are copyrighted to NASA, NASA JPL/Caltech, and ESA.

"One transport truck-sized asteroid passed the Earth Wednesday morning and another will soar by in the afternoon, with both far closer to the planet than the moon. There is no danger of the Earth being hit and both should be visible with moderate-sized amateur telescopes, NASA reported."

"Time lapse sequences of photographs taken by the crew of expeditions 28 & 29 onboard the International Space Station from August to October, 2011, who to my knowledge shot these pictures at an altitude of around 350 km. " Shooting locations in order of appearance: 1. Aurora Borealis Pass over the United States at Night 2. Aurora Borealis and eastern United States at Night 3. Aurora Australis from Madagascar to southwest of Australia 4. Aurora Australis south of Australia 5. Northwest coast of United States to Central South America at Night 6. Aurora Australis from the Southern to the Northern Pacific Ocean 7. Halfway around the World 8. Night Pass over Central Africa and the Middle East 9. Evening Pass over the Sahara Desert and the Middle East 10. Pass over Canada and Central United States at Night 11. Pass over Southern California to Hudson Bay 12. Islands in the Philippine Sea at Night 13. Pass over Eastern Asia to Philippine Sea and Guam 14. Views of the Mideast at Night 15. Night Pass over Mediterranean Sea 16. Aurora Borealis and the United States at Night 17. Aurora Australis over Indian Ocean 18. Eastern Europe to Southeastern Asia at Night

"New images, acquired on May 24, 2010 by the Multi-angle Imaging SpectroRadiometer (MISR) instrument aboard NASA's Terra spacecraft, show the encroachment of oil from the former Deepwater Horizon rig into Louisiana's wildlife habitats."

"Rocks examined by NASA's Spirit Mars Rover hold evidence of a wet, non-acidic ancient environment that may have been favorable for life. Confirming this mineral clue took four years of analysis by several scientists."

"hauls cars carrying the Ares I-X motor segments and nozzle exit cone over a river bridge to NASA's Kennedy Space Center in Florida. The four reusable motor segments and the nozzle exit cone, manufactured by the Ares I first-stage prime contractor Alliant Techsystems Inc., or ATK, departed Utah March 12 on the seven-day, cross-country trip to Florida. (NASA/Kim Shiflett) #"

The Big Picture - News Stories in Photographs from the Boston Globe

NASA's Cassini spacecraft is now a nearly a year into its extended mission, called Cassini Equinox (after its initial 4-year mission ended in June, 2008). The spacecraft continues to operate in good health, returning amazing images of Saturn, its ring system and moons, and providing new information and science on a regular basis.

Saturn's tiny, icy moon Enceladus has recently been visited by NASA's Cassini orbiter on several very close approaches - once coming within a mere 25 kilometers (15 miles) of the surface. Scientists are learning a great deal about this curious little moon. Only about 500 kilometers wide (310 miles), it is very active, emitting internal heat, churning its surface, and - through cryovolcanism - ejecting masses of microscopic ice particles into Saturnian orbit.

Newly discovered Alcor B orbits its larger sibling and was caught in the act with an innovative technique called "common parallactic motion" by members of Project 1640, an international collaborative team that includes astrophysicists at the American Museum of Natural History, the University of Cambridge's Institute of Astronomy, the California Institute of Technology, and NASA's Jet Propulsion Laboratory.

The landscapes of other planets have long been the source of fantasies and speculation, but in the last few decades we've finally been able to get a close-up view of the surfaces of alien worlds. NASA's Mars Reconnaissance Orbiter (MRO) has been orbiting Mars since 2006, and on board is the High Resolution Imaging Science Experiment camera, or HiRISE.