Interesting and odd things that Colman Jones has found around the web, mostly photography and music, with a focus on experimental art, nature, tasteful nudes, and lots of cats and other various furry animals.
NuSTAR untangles mystery of how stars explode
One of the biggest mysteries in astronomy, how stars blow up in supernova explosions, finally is being unraveled with the help of NASA’s Nuclear Spectroscopic Telescope Array (NuSTAR).
The high-energy X-ray observatory has created the first map of radioactive material in a supernova remnant. The results, from a remnant named Cassiopeia A (Cas A), reveal how shock waves likely rip apart massive dying stars.
"Stars are spherical balls of gas, and so you might think that when they end their lives and explode, that explosion would look like a uniform ball expanding out with great power," said Fiona Harrison, the principal investigator of NuSTAR at the California Institute of Technology (Caltech) in Pasadena. "Our new results show how the explosion’s heart, or engine, is distorted, possibly because the inner regions literally slosh around before detonating."
Cas A was created when a massive star blew up as a supernova, leaving a dense stellar corpse and its ejected remains. The light from the explosion reached Earth a few hundred years ago, so we are seeing the stellar remnant when it was fresh and young.
Supernovas seed the universe with many elements, including the gold in jewelry, the calcium in bones and the iron in blood. While small stars like our sun die less violent deaths, stars at least eight times as massive as our sun blow up in supernova explosions. The high temperatures and particles created in the blast fuse light elements together to create heavier elements.
NuSTAR is the first telescope capable of producing maps of radioactive elements in supernova remnants. In this case, the element is titanium-44, which has an unstable nucleus produced at the heart of the exploding star.
The NuSTAR map of Cas A shows the titanium concentrated in clumps at the remnant’s center and points to a possible solution to the mystery of how the star met its demise. When researchers simulate supernova blasts with computers, as a massive star dies and collapses, the main shock wave often stalls out and the star fails to shatter. The latest findings strongly suggest the exploding star literally sloshed around, re-energizing the stalled shock wave and allowing the star to finally blast off its outer layers.
Image credit: NASA/JPL-Caltech/CXC/SAO
Buddha at Ngyen Khag Taktsang Monastery
(Source: , via futurepredictor)
coming through in waves
Melanie Smith, Still from The Colour Green, 2014. HD Video, 2:26 min.
Next Thursday, Join artist Melanie Smith at the opening reception of The Color Green at Sicardi Gallery in Houston. The artist will lecture on Tuesday, Feb. 25th at 7PM at the Rice University Media Center and will hold a book signing at Sicardi on the 28th at 11AM.
Smith will also be featured in a solo exhibition at the Contemporary Arts Museum Houston from March 21 – June 15, 2014. Learn more about her exhibition at CAMH on our website.