Today, the coolest known starlike orb is a brown dwarf
discovered last year.
ISLAMABAD -- Astronomers have discovered the first aurora outside our solar system, around a brown dwarf
about 18 light years away from Earth and up to 10,000 times more powerful than any previously seen.
A brown dwarf
, or "failed star", is an object more massive than a planet yet too small to trigger the thermonuclear reactions that power stars.
Exoplanets are the distant offspring of a star beyond our sun, a brown dwarf
, or a stellar corpse.
But scientists estimate it is probably a brown dwarf
rather than a planet since brown dwarfs
are known to be fairly common.
The newfound coldest brown dwarf
is named WISE J085510.
Spitzer's infrared observations helped determine the frosty temperature of the brown dwarf
They peered out into space at a brown dwarf
named ISO-Oph 102.
Solar system planetary scientists, brown dwarf
and exoplanet observers and theoreticians, molecular spectroscopists, and instrument specialists discuss methods and findings in the composition of atmospheres around planets beyond the solar system.
Dubbed CFBDSIR 1458 10b, the brown dwarf
has a remarkably low surface temperature of 97 degrees C (206 degrees F) - just about as hot as a freshly made morning cup of coffee.
Alan Boss, an exoplanet expert at the Carnegie Institution of Washington, and Lisa Kaltenegger, a Harvard exoplanet hunter, both said more study was needed to confirm the new set of photos were those of proven planets and not just brown dwarf
Scattered among the galaxy are brown dwarf
stars, capable of producing energy to heat colonizing stations and power starships.