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Latest Stellar evolution Stories

Survey Hints At Origin Of Type Ia Supernovae
2011-10-08 05:13:10

The largest survey to date of distant exploding stars is giving astronomers new clues to what´s behind the Type Ia supernovae they use to measure distances across the cosmos. These stellar explosions helped astronomers conclude more than a decade ago that dark energy is accelerating the expansion of the universe, and today (Tuesday, Oct. 4) earned the discoverers — including UC Berkeley physicist Saul Perlmutter — the 2011 Nobel Prize in Physics. But what caused them was a...

Image 1 - Astronomers Discover The Fried Egg Nebula
2011-09-28 09:41:23

[ Watch the Video ] University of Manchester astronomers used the European Southern Observatory's Very Large Telescope (VLT) to discover the Fried Egg Nebula. The newly discovered star has a diameter of about a thousand times bigger than the Sun and is about 13,000 light-years away from Earth.  It is the closest hypergiant found so far and shines about 500,000 times brighter than the Sun "This object was known to glow brightly in the infrared but, surprisingly, nobody had...

Image 1 - Herschel Probes Dusty Past Of A Giant Star
2011-09-20 08:52:45

  About 5 thousand million years from now, our Sun will expand into a red giant, swelling to such a size that it may swallow the Earth. It will then begin to shed huge amounts of dust, surrounding itself with an expanding circumstellar envelope (CSE) that ultimately will become a planetary nebula. New insights into this process have been revealed by ESA's Herschel Space Observatory, which is providing unprecedented images of the complex, outer structure of a nearby CSE. As part of...

2011-09-14 06:46:47

High-performance networks speed data on explosion's early discovery A recent discovery by scientists at the Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California, Berkeley, of a supernova within hours of its explosion was made possible by a specialized telescope, state-of-the-art computational tools — and the high-speed data transmissions network of UC San Diego's High-Performance Wireless and Research Education Network (HPWREN), as well as the...

Image 1 - Supernova Reaching Its Peak Brightness Thursday And Friday
2011-09-08 13:19:14

Astronomers will be losing sleep as they wait on a newly discovered supernova to reach its peak in brightness on Thursday and Friday. The exploding star is about 21 million light years away and was first spotted by telescopes August 23. It is the closest of its kind to be seen in four decades and is located in the "Pinwheel Galaxy" above the Big Dipper. Amateur star-gazers could even equip themselves with 20x80 binoculars to help see the exploding star. Astronomers say that the...

White Dwarfs May Need To Slow Down Before Going Supernova
2011-09-07 04:24:24

  Older stars may have to slow down their rotations before exploding as supernovae, according to a new study published earlier this month by scientists at the Harvard-Smithsonian Center for Astrophysics (CfA). In a September 6 press release, the researchers compare the phenomenon to "Speed," a motion picture whose plot revolves around a bus that will explode if it travels too slowly. According to their findings, which have been published in The Astrophysical Journal Letters, the...

2011-09-06 20:35:00

TelescopeKing.com - According to sciencenews.org, on August 24, 2011, astronomers discovered a supernova in progress located in the M101 galaxy. This discovery was unique because the supernova was in its early stages and had been estimated to have begun a mere 12 hours earlier. Secondly, the supernova is very close to earth, relatively speaking. It was predicted that the peak of the explosion would occur in early September, and that prediction seems to be very accurate as the...

2011-08-30 06:40:13

A team of scientists, led by Michael Rauch from the Carnegie Observatories, has discovered a distant galaxy that may help elucidate two fundamental questions of galaxy formation: How galaxies take in matter and how they give off energetic radiation. Their work will be published in the Monthly Notices of the Royal Astronomical Society. During the epoch when the first galaxies formed, it is believed that they radiated energy, which hit surrounding neutral hydrogen atoms and excited them to...

Spiral galaxy top view
2011-08-29 11:32:12

  Researchers at the University of California, Santa Cruz have used a supercomputer to create a spiral galaxy that matches our own Milky Way galaxy. The computer simulation is part of a physics project involving galaxy formation and evolution. "Previous efforts to form a massive disk galaxy like the Milky Way had failed, because the simulated galaxies ended up with huge central bulges compared to the size of the disk," Javiera Guedes, a graduate student in astronomy and...

space-082711-002a
2011-08-27 05:18:42

  A team of scientists has discovered a supernova closer to Earth than any of its kind in a generation. Astronomers believe the supernova they caught, which is about 21 million light years away from Earth, is just within hours of its explosion. Scientists around the world are scrambling to observe it with as many telescopes as possible, including the Hubble Space Telescope.  Andy Howell, adjunct professor of physics at University of California - Santa Barbara (UCSB) and...


Latest Stellar evolution Reference Libraries

Stellar Astrophysics
2014-01-12 00:00:00

The prominent feature that allows for the existence of life on Earth is the Sun. Radiation from our closest star provides heat and energy to our planet, driving biological processes and providing the necessary conditions for liquid water to naturally exist. But our Sun is only but one star in this vast Universe. And as it turns out, most stars are quite different than the one that illuminates our day. For this reason, scientists have, for hundreds of years, attempted to study the other...

7_4b235c0bfbfc8504a41844f9c48ad8962
2004-10-19 04:45:43

Hertzsprung-Russell Diagram -- In stellar astronomy, the Hertzsprung-Russell diagram (H-R diagram) shows the relation between the absolute magnitude and the spectral types of stars. It was invented around 1910 by Ejnar Hertzsprung and Henry Norris Russell. There are two equivalent forms. One is the observer's form which plots the color of the star on one axis and the absolute magnitude on the other axis. The theoretician's form plots the temperature of the star on one axis and the...

6_c21be0ecb1b565a9be109a383c38223f2
2004-10-19 04:45:43

White Dwarf -- A white dwarf is a a star supported by electron degeneracy. A star like our Sun will become a white dwarf when it has exhausted its nuclear fuel. Near the end of its nuclear burning stage, such a star goes through a red giant phase and then expels most of its outer material (creating a planetary nebula) until only the hot (T > 100,000 K) core remains, which then settles down to become a young white dwarf. A typical white dwarf is half as massive as the Sun, yet only...

6_19859ff34fd03d00777232e2520ce83f5
2004-10-19 04:45:42

Supernova Remnant -- A supernova remnant (SNR) is made up of the materials left behind by the gigantic explosion of a star in a supernova. There are two possible routes to this end: either a massive star may cease to generate fusion energy in its core, and collapse inward under the force of its own gravity, or a white dwarf star may accumulate material from a companion star until it reaches a critical mass and undergoes a similar collapse. In either case, the resulting supernova...

6_79c799b9f03f60809a9d0aecf38491202
2004-10-19 04:45:42

Supernova -- A supernova is a star that increases its brightness drastically within a matter of days, making it appear as if a "new" star was born (hence "nova"). The "super" prefix distinguishes it from a mere nova, which also involves a star increasing in brightness, though to a lesser extent and through a much different mechanism. Astronomers have classified supernovae in several classes, according to the lines of different elements that appear in their spectra. The first...

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Word of the Day
mundungus
  • A stinking tobacco.
  • Offal; waste animal product; organic matter unfit for consumption.
This word comes from the Spanish 'mondongo,' tripe, entrails.