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Cold planet/brown dwarf discovered
"It is remarkable that even after many decades of studying the sky, we
still do not have a complete inventory of the sun's nearest neighbors," http://www.nasa.gov/jpl/wise/spitzer.../#.U1rZx15HuIk How little we know actually. This thing is 7 ly away only. Dark, cold, invisible. Is it one of the wandering "lost" planets that were announced some time ago? In any case it is dark matter :-) it doesn't shine very much at a temperature of -48C to -13C. It is old, since it has cooled a lot. This is an interesting discovery. |
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Cold planet/brown dwarf discovered
On 4/26/2014 11:33 AM, jacob navia wrote:
"It is remarkable that even after many decades of studying the sky, we still do not have a complete inventory of the sun's nearest neighbors," http://www.nasa.gov/jpl/wise/spitzer.../#.U1rZx15HuIk How little we know actually. This thing is 7 ly away only. Dark, cold, invisible. Is it one of the wandering "lost" planets that were announced some time ago? In any case it is dark matter :-) it doesn't shine very much at a temperature of -48C to -13C. It is old, since it has cooled a lot. This is an interesting discovery. That reminds me of the question of the nearest black hole! Some decades ago they were thought to be quite numerous. See e.g. R.D. Blandford in "300 years of gravitation," edited by Hawking and Isreal, Cambridge U. Press, 1987, page 319, where a simple estimate leads to: "the nearest one would be less than 5pc away". But where is it really? -- Jos |
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