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The Daily Cosmos

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The Daily Cosmos

Cosmology
Astrophysics
Astronomy

Location: #science
Members: 58
Latest Activity: 1 hour ago

 

Cosmology - Astrophysics - Astronomy

 

Hubble Wallpaper - Awesome Hubble Images

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Comment by Michel on March 13, 2011 at 8:20am

Newly found brown dwarf is ultra-cool

New Scientist 12 March 2011

WE THINK of stars, even the failed ones called brown dwarfs, as being lethally hot. That picture has been confounded by a newly discovered brown dwarf - at room temperature.

Like fully fledged stars, brown dwarfs form from collapsing gas clouds, but they are not massive enough to sustain nuclear reactions. Instead, they briefly shine red from the heat of formation, then fade. Still, the coolest known brown dwarfs are all hot enough to roast any spacefarers who venture too close.

Now Kevin Luhman of Pennsylvania State University in University Park and colleagues have used NASA's infrared Spitzer Space Telescope to detect the glow of what appears to be a brown dwarf at just 30 °C (Astrophysical Journal Letters, DOI: 10.1088/2041-8205/730/1/L9).

The object, which orbits a white dwarf star 63 light years from Earth, weighs seven times as much as Jupiter. At that mass, it would normally be considered a planet. But planets form from discs of gas and dust around stars, and the researchers say that the object, known as WD 0806-661 B, lies too far from its star - at 2500 times the Earth's distance from the sun - to be deemed a planet if it formed where it is.

The object is a lot hotter than Jupiter, which is at a frigid -149 °C, and much cooler than the next coolest brown dwarf, at 100 °C. This means that WD 0806-661 B will act as a "missing link" to reveal how temperature affects the atmosphere and spectral features of objects that are roughly the size of Jupiter.

Comment by Doone on March 12, 2011 at 7:17pm
Comment by Michel on March 11, 2011 at 10:06am

A trip to Mercury: Edge of the Inferno

A 6.5 years expedition:

 


Learn more about NASA's Messenger mission, the first ever set to orbit the planet Mercury, in this SPACE.com infographic.
Source SPACE.com: All about our solar system, outer space and exploration

Comment by Doone on March 11, 2011 at 5:55am
Double Eclipse on Jupiter as Explained by Start with a Banghttp://scienceblogs.com/startswithabang/?utm_source=bloglist&ut...
Comment by Michel on March 9, 2011 at 2:12pm

Eye Candy.

The ISS in full details (Click to really have a good look) - what an impressive machine! (From APOD)

Comment by Adriana on March 8, 2011 at 5:24pm
Do it! The first post will have to be about homeopathy, I think, LOL
Comment by Michel on March 8, 2011 at 5:21pm
Do it DG.
Comment by A Former Member on March 8, 2011 at 5:19pm
You guys like the idea? How about "WHEN PIGS FLY: A group about unbelieveable nonsense"?
Comment by Adriana on March 8, 2011 at 5:05pm
When pigs fly? I like it. If pigs flied we would need really strong, sturdy umbrellas :)
Comment by A Former Member on March 8, 2011 at 4:55pm
How about I create a skeptics group and call it WHEN PIGS FLY?
 
 
 

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