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Solar Wind Transforms Venus into Shape of Comet

Earth's ionosphere never becomes cometlike largely because the planet has its own magnetic field that balances out the sun's influence, but Venus lacks its own magnetic field and is therefore subject to the whims of the sun's solar wind...

January 31, 2013 — Miriam Kramer and

"Habitable Zone" for Alien Planets Redefined

Scientists have altered the criteria for the habitable zone—an area not too close or far away from a star—taking into account whether planets can host liquid water. This redefines where researchers believe life-forms could exist...

January 29, 2013 — Clara Moskowitz and
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The Essential Guide to the Modern World

The Essential Guide to the Modern World