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Cold planet/brown dwarf discovered



 
 
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  #1  
Old April 26th 14, 10:33 AM posted to sci.astro.research
jacob navia[_5_]
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Posts: 543
Default 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.
  #2  
Old April 26th 14, 11:58 AM posted to sci.astro.research
Jos Bergervoet
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Posts: 126
Default 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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