Life-or-Death Question: How Supernovas Happen
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Lately, supernovas have become signal events in the life of the cosmos, as told by modern science.
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By Thomas R. Webber  Contrary to popular notion, "shooting stars" (meteors) have nothing to do with stars at all. In fact, size-wise, they might not even seem very noteworthy.
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A new image from NASA's Spitzer Space Telescope shows the shimmering embers of a dying star, and in their midst a mysterious doughnut-shaped ring. The dying star is part of a "planetary nebula" called NGC 246. When a star like our own Sun begins to run out of fuel, its core shrinks and heats up, boiling off the star's outer layers.
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Ã stata l&#39;esplosione di una supernova a dare origine ai raggi cosmici: si chiarisce cosÃ¬, dopo un secolo di ricerche, l&#39;origine delle misteriose particelle ricchissime di energia che bombardano la Terra dallo spazio e che si Â«scontranoÂ» contro l
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NASA -- If we were able to see Gamma-Ray Bursts (GRBs) with the naked eye, they would look as though the universe were taking daily flash photos of us from different parts of the sky.    Never occurring in the same spot twice, GRBs are totally unpredictable...
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The energy created when black holes merge contributes to star formation while&nbsp;blowing gas to the outskirts of a galaxy, this creates&nbsp;a limit as to how much the black hole can consume, a new computer simulation shows.
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Teams of international scientists have  used observations from NASA's Swift satellite and other  telescopes to witness the evolution of a cosmic blast into a  stellar explosion or supernova.
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Tiny meteors, typically no larger than a grain of sand, frequently bore hot tunnels through Earth&#39;s air to leave behind thin, glowing trails of gas. We sometimes see them as dramatic &quot;shooting stars.&quot;
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s collisions go, the one taking place in the vicinity of the constellation Hydra is a doozy. Out there, some 800 million light-years from Earth, two galactic clusters - one with about 1,000
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Imagine two stars with winds so intense that they eject an Earthâs worth of material roughly once every month. Next, imagine those two winds colliding head-on. Such titanic collisions produce multimillion-degree gas, which radiates brilliantly in X-rays.
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The Genesis desert crash has left scientists wondering about the delicate condition of its solar wind collection. The first release of samples to the community has begun, while new tests for oxygen-isotopes may help uncover which particles might have lunar, solar or terrestrial origins.
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Scientists have now officially witnessed the perfect cosmic storm. Thanks to the European Space Agency's XMM-Newton observatory, they watched a nearby head-on collision between two galaxy clusters. The clusters smashed together thousands of galaxies and trillions of stars in one of the most powerful events ever witnessed.
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Gamma rays would be lethal to humans if it were not for the Earth&#39;s atmospheric shield. The rays emanate from astonishingly powerful phenomena, such as supernovae - massive stars that, when all their fuel has expired, perish in a violent explosion.
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Those who are involved in popularizing astronomy are asked certain questions time and again.&nbsp; One of these is 'How many stars are there?' Only when one is blessed with a rare glimpse of a star-spangled sky with its myriad luminaries, can we understand why this question occurs.&nbsp; Special computer analysis can readily answer the question.&nbsp;
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Out of death may come a rebirth. The alternative is much more likely to happen. And if it does the consequence will be a living hell that will go on and on and on.
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A simple question yields a surprising answer.
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Astronomers have produced the first truly useful image ever of something in space using gamma rays. It's a picture only an astronomer could love, but it appears to help solve a century-long mystery.