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Plasma plumes help shield Earth from damaging solar storms
The Earth's magnetic field, or magnetosphere, stretches from the planet's core out into space, where it meets the solar wind, a stream of charged particles emitted by the sun. For the most part, the ... more
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Hubble Telescope Witnesses Asteroid's Mysterious Disintegration
NASA's Hubble Space Telescope has recorded the never-before-seen break-up of an asteroid into as many as 10 smaller pieces. Fragile comets, comprised of ice and dust, have been seen falling apart as ... more
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New NASA Van Allen Probes Observations Helping To Improve Space Weather Models
When events in the two giant doughnuts of radiation around Earth - called the Van Allen radiation belts - cause the belts to swell and electrons to accelerate to 99 percent the speed of light, near ... more
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Critical mass not needed for supernova explosions
Astronomers searching for clues about dark energy, the mysterious force that is speeding up the expansion of the Universe, have uncovered new evidence about the nature of supernovae, finding many ar ... more
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