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Posts Tagged "brown dwarf"

Observations

Astronomer Locates Previously Unseen Neighbor to the Sun

WISE-1049-5319

When NASA launched the WISE satellite in 2009, astronomers hoped it would be able to spot loads of cool, dim objects known as brown dwarfs. Bigger than a planet, a brown dwarf is not quite a star, either—it is too small to sustain the nuclear fusion reactions that turn hydrogen to helium. But it may [...]

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Observations

Massive Planets Might Escape Stellar Engulfment Largely Undiminished

exoplanets, red giant, stellar evolution

Having your planet swallowed by a star is no fun. But some planets might be able to run the astrophysical gauntlet and make it through more or less intact. When a star comparable to or somewhat larger than the sun enters advanced age, it swells up into a red giant, expanding far beyond its original [...]

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