Despite the name, most black holes are among the brightest objects in the universe, because gas and other matter falling in is superheated and glows as it accretes. But a satiated black hole effectively has zero temperature, barring a trickle of particles released by a process called Hawking radiation, meaning it could potentially act as a cold sun, says Opatrný. “We need a fairly old black hole that has already cleared its surroundings and which is not further fed.”
Compared to this chilly character, the rest of the universe is a relatively balmy 2.7 kelvin (about -270 ˚C), thanks to the cosmic microwave background (CMB), the heat left over from the explosion of the big bang. The team calculated that an Earth-sized planet orbiting a black hole that appeared a similar size to our sun in the sky could extract around 900 watts of useful power from this temperature difference – enough for life to potentially exist, but hardly enough to run a civilisation.
Read more: http://buff.ly/1T7tN63
From Universe Today: Evidence of water and a warmer, wetter climate abound on Mars, but did life ever put its stamp on the Red Planet? Rocks may hold the secret. Knobby protuberances of rock discovered by the Spirit Rover in 2008 near the rock outcrop Home Plate in Gusev Crater caught the attention of scientists back on Earth. They look like cauliflower or coral, but were these strange Martian rocks sculpted by microbes, wind or some other process? Read more: http://www.universetoday.com/127238/potential-life-on-mars-follow-the-cauliflower/
Image Credit: Cmglee (Own work) CC BY-SA 3.0 or GFDL, via Wikimedia Commons
The hydrogen in your body, present in every molecule of water, came from the Big Bang. There are no other appreciable sources of hydrogen in the universe. The carbon in your body was made by nuclear fusion in the interior of stars, as was the oxygen. Much of the iron in your body was made during supernovas of stars that occurred long ago and far away. The gold in your jewelry was likely made from neutron stars during collisions that may have been visible as short-duration gamma-ray bursts. Elements like phosphorus and copper are present in our bodies in only small amounts but are essential to the functioning of all known life. The featured periodic table is color coded to indicate humanity's best guess as to the nuclear origin of all known elements. The sites of nuclear creation of some elements, such as copper, are not really well known and are continuing topics of observational and computational research.
Diamonds are forever, but these blue-white stars are not. They are burning their hydrogen fuel so ferociously they will explode as supernovae in just a few million years. The combination of outflowing stellar "winds" and, ultimately, supernova blast waves will carve out cavities in nearby clouds of gas and dust. These fireworks will kick-start the beginning of a new generation of stars in an ongoing cycle of star birth and death.
Biostacis - Enemy Of The State [TECH ITCH RECORDINGS]
Genre: Drum & Bass. First track from the new Biostacis (Tech Itch & Ice Minus) album 'Re:Generation' Pre order available now @ http://store.
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