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ODDBALL EXOPLANET IS DARKER THAN COAL
A planet orbiting a distant star is darker than coal, reflecting less than one percent of the starlight falling on it, according to a paper published on Thursday.
The strange world, TrES-2b, is a gas giant the size of Jupiter, rather than a solid, rocky body like Earth or Mars, astronomers said.
It closely orbits the star GSC 03549-02811, located about 750 light years away in the direction of the constellation of Draco the Dragon.
"TrES-2b is considerably less reflective than black acrylic paint, so it's truly an alien world," David Kipping of the Harvard-Smithsonian Center for Astrophysics said in a press release issued by Britain's Royal Astronomical Society (RAS).
DiscoveryNews
Originally posted by CLPrime
reply to post by Thebel
The fact that this planet only reflects 1% of the light that falls on it isn't the interesting part. Stars, for example, reflect almost negligible amounts of light, making them effective black bodies. What's interesting is that this planet can absorb 99% of the light that falls on it without emitting vast amounts of its own light.
My assumption would be that this is about as fine a line as we can draw between dwarf stars and regular stars. Dwarfs approach black bodies, going from red to brown, without emitting much light of their own, and stars are effective black bodies, re-emitting almost none of the light that falls on them, while emitting vast amounts of their own. This "planet" would appear to be in the middle, or perhaps a combination of the two - it re-emits almost no light, and emits almost no light of its own. That, again I would assume, would make it the most effective known black body in the universe, short of the CMB.
Impressive.
"However, it's not completely pitch black. It's so hot that it emits a faint red glow, much like a burning ember or the coils on an electric stove."
It closely orbits the star GSC 03549-02811, located about 750 light years away in the direction of the constellation of Draco the Dragon.