Alfred Tennyson wrote:We are not now that strength which in old days
Moved earth and heaven, that which we are, we are;
One equal temper of heroic hearts,
Made weak by time and fate, but strong in will
To strive, to seek, to find, and not to yield.
Rod_Cloutier wrote:It was announced this week that a faint object in the Ort cloud could be a brown dwarf star in orbit around the sun, making our star system a binary system:
http://phys.org/news/2015-12-discovery- ... solar.html
https://youtu.be/F5oDY_hwcLw
The obvious question then is, what is its nature and why has
it escaped earlier detection? Is it always too close to the binary?
Is it too cold? In that case, i.e., at temperatures below a hundred
Kelvin or so, the non-detection at shorter wavelengths, with e.g.
WISE, would be reconcilable.
http://arxiv.org/pdf/1512.02652v1.pdf
pstarr wrote:The Overlords. They have come! Prepare a virgin for sacrifice. Bring out Trump!
Keith_McClary wrote:Pretty cool star:
Brown dwarfs are objects which are too large to be called planets and too small to be stars. They have masses that range between twice the mass of Jupiter and the lower mass limit for nuclear reactions (0.08 times the mass of our sun).
https://www.google.com/?gws_rd=ssl#q=is+a+brown+dwarf+a+star
A star is a luminous sphere of plasma held together by its own gravity.
https://en.wikipedia.org/wiki/Star
Brown dwarfs are substellar objects not massive enough to sustain hydrogen-1 fusion reactions in their cores, unlike main-sequence stars. They occupy the mass range between the heaviest gas giants and the lightest stars, with an upper limit around 75[1] to 80 Jupiter masses (MJ). Brown dwarfs heavier than about 13 MJ are thought to fuse deuterium and those above ~65 MJ, fuse lithium as well.
https://en.wikipedia.org/wiki/Brown_dwarf
AgentR11 wrote:Think of the gravity assist you could get off something that massive, very dense, and yet cold enough to skim very deep into its gravity well.
To me, just spit-balling of course, if its really there, it makes the presence of comets in our current solar system much more reasonable. Its always kinda bugged me that objects that are as temporary as comets seem so plentiful, regularly travelling inside our own orbit. Something heavy has to be out there flinging them in from time to time. So a brown dwarf does the job, punts a big chunk of ice&muck inbound, saturn/jupiter pick it up and either eat it, shred it, or put it in an orbit that gives us another Bob the Comet for a few million years until the sun burns its mass away.
That'll be really cool if that is what's going on.
Alfred Tennyson wrote:We are not now that strength which in old days
Moved earth and heaven, that which we are, we are;
One equal temper of heroic hearts,
Made weak by time and fate, but strong in will
To strive, to seek, to find, and not to yield.
Nemesis is a hypothetical red dwarf[1] or brown dwarf,[2] originally postulated in 1984 to be orbiting the Sun at a distance of about 95,000 AU (1.5 light-years),[2] somewhat beyond the Oort cloud, to explain a perceived cycle of mass extinctions in the geological record, which seem to occur more often at intervals of 26 million years.[2][3] As of 2012, over 1800 brown dwarfs have been identified and none of them are inside the Solar System.[4] There are actually fewer brown dwarfs in our cosmic neighborhood than previously thought. Rather than one star for every brown dwarf, there may be as many as six stars for every brown dwarf.[5] The majority of solar-type stars are single.[6]
PrestonSturges wrote:There's a lot of New Age BS associated with the idea, but people have kicked around the idea of "Nemesis" or "Planet X" for some time. Nemesis is more scientific, Planet X is more doomsday silly.
https://en.wikipedia.org/wiki/Nemesis_( ... tical_star)Nemesis is a hypothetical red dwarf[1] or brown dwarf,[2] originally postulated in 1984 to be orbiting the Sun at a distance of about 95,000 AU (1.5 light-years),[2] somewhat beyond the Oort cloud, to explain a perceived cycle of mass extinctions in the geological record, which seem to occur more often at intervals of 26 million years.[2][3] As of 2012, over 1800 brown dwarfs have been identified and none of them are inside the Solar System.[4] There are actually fewer brown dwarfs in our cosmic neighborhood than previously thought. Rather than one star for every brown dwarf, there may be as many as six stars for every brown dwarf.[5] The majority of solar-type stars are single.[6]
The BS part is the 1950 book “Planets In Collision "by Immanual Velikovsky, a Russian psychiatrist with a keen interest in the Bible.
Alfred Tennyson wrote:We are not now that strength which in old days
Moved earth and heaven, that which we are, we are;
One equal temper of heroic hearts,
Made weak by time and fate, but strong in will
To strive, to seek, to find, and not to yield.
Cog wrote:There is no brown dwarf star out there. The article is derp. We would have already detected the gravity perturbations from it. There is something there but it ain't no dead star. Not enough mass.
fleance wrote:There is no clear studies whether that object is brown dwarf or asteroid. However, it looks like asteroid.
Sixstrings wrote:fleance wrote:There is no clear studies whether that object is brown dwarf or asteroid. However, it looks like asteroid.
Did I misunderstand all this? I thought they did something already to figure out that it's "super earth" sized? If that hasn't been determined yet, then yeah, there's no reason to speculate it's a brown dwarf.
But an asteroid would not be "super earth" sized -- something that big, is a PLANET. Or brown dwarf.. if there's any fusion going on..
Home Astronomy & Space Astronomy December 11, 2015
(Phys.org)—Two separate teams of researchers (one from Mexico, the other Sweden), have incited skepticism among the astronomy community by posting papers on the preprint server arXiv each describing a different large object they observed in the outer edges of the solar system. Both teams made their observations after reviewing data from ALMA—a cluster of radio dishes in the Chilean mountains.
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