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NASA's Solar Dynamics Observatory amazed onlookers last week when it flew past a sundog and destroyed it. Must-see videos of the event captured shock waves from the rocket billowing through the sundog, eliciting cries of delight and amazement from the crowd below.

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Imagine holding the entire sun in the palm of your hand. Now you can. A new iPhone app developed by NASA-supported programmers delivers a live global view of the sun directly to your cell phone.

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Terrestrial gamma-ray flashes (TGFs) surge through thunderstorms at about the same altitude where commercial airliners fly. Do these blasts of gamma-radiation pose a hazard to air travelers?

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The Solar Dynamics Observatory (SDO), slated for liftoff on Feb. 9th, will make IMAX-quality movies of solar explosions, peer beneath the stellar surface to see the sun's inner dynamo, and--researchers hope--unravel the mysteries of solar variability.

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NASA's Hubble Space Telescope has observed a mysterious X-shaped debris pattern and trailing streamers of dust that suggest a head-on collision between two asteroids.

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There's a mystery in the skies of Earth: Something is producing bright flashes of gamma radiation in the upper atmosphere of our own planet. A new NASA-NSF mission called Firefly is going to investigate.

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This week Earth and Mars are having a close encounter. On Jan. 27th, the Red Planet will be only 99 million kilometers away and look bigger through a telescope than at any time between 2008 and 2014.

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NASA announced today that Mars rover Spirit cannot be freed from its Martian sandtrap. Now the rover will begin a second career as a stationary science platform.

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Evidence is mounting that a strong magnetic field lurks just beyond the edge of the solar system. This could explain the recent discovery of a "giant ribbon" in space by NASA's IBEX spacecraft.

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NASA's next great observatory, the James Webb Space Telescope, is designed to study stars and galaxies. Astronomers are beginning to realize, however, that Webb will make a great planet hunter too.

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Most astronomers wouldn't dream of opening their observatory's doors in 100 mph winds. Yet NASA's new SOFIA telescope recently flew in an airplane at 250 mph with doors wide open.

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NASA is building a new space telescope named "NuSTAR" to answer a question that has been vexing astrophysicists for decades: Why won't the supernova explode?

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NASA's Kepler space telescope, designed to find Earth-size planets in the habitable zone of sun-like stars, has discovered its first five new exoplanets.

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NASA's Mars rover Spirit is about to mark six years of Red Planet exploration. However, the upcoming Martian winter could end the roving career of the beloved, scrappy robot.

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Party planners take note. For the first time in almost twenty years, there's going to be a Blue Moon on New Year's Eve.

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The solar system is passing through an interstellar cloud that physics says should not exist. In the Dec. 24th issue of Nature, a team of scientists reveal how NASA's Voyager spacecraft have solved the mystery.

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NASA's Cassini Spacecraft has captured the first flash of sunlight reflected off a lake on Saturn's moon Titan, confirming the presence of liquid on the part of the moon dotted with many large, lake-shaped basins.

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A continent-wide network of all-sky cameras has photographed a never-before-seen phenomenon: colliding auroras that produce explosions of light. The must-see images have solved a long-standing mystery of Northern Lights.

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This week, researchers attending the United Nations Climate Change Conference in Copenhagen unveiled a unique web site that gathers and organizes climate data for decision makers, professional scientists and lay people.

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The Geminid meteor shower has been intensifying in recent years, and researchers say 2009 could be the best year yet. This year's display peaks on Dec. 13th and 14th.

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