Latest Stellar evolution Stories

Milky Way In 3D
2013-09-13 11:09:37

John P. Millis, PhD for redOrbit.com - Your Universe Online Because of our location within the Milky Way, it is quite a challenge to get a bird’s eye view of our galaxy. To really get a sense for what our corner of the cosmos really looks like, astronomers have to take detailed measurements of billions of stars and attempt to accurately measure their distance from Earth. Researchers at the Max Planck Institute for Extraterrestrial Physics (MPE) have now created the most detailed model...

Clumpy Structure Makes Disk Galaxies Look Alike Over Time
2013-09-12 06:49:36

redOrbit Staff & Wire Reports - Your Universe Online Researchers at Iowa State University and IBM have identified why virtually all disk galaxies grow out of their irregular, clumped appearance, and why their older stars acquire the same smooth look as they fade from a bright center to a faint edge. The astronomers say that whether these young disk galaxies are big, small, isolated or crowded in a cluster, the reason they all eventually look alike is due to their clumpy structure,...

Bizarre Alignment Observed In Butterfly-Shaped Nebulae
2013-09-04 08:57:07

Lee Rannals for redOrbit.com - Your Universe Online A new study by astronomers from the University of Manchester shows how planetary nebulae line up in the sky in the same way. A planetary nebula occurs in the final stages of a star's life when its outer layers begin to stretch out into the surrounding space. Such nebulae can create beautiful objects in the night sky, with some stretching out into an hourglass or butterfly shape. The latest research, published in the Monthly Notices of...

Nova Visible With Naked Eye
2013-08-20 10:36:11

John P. Millis, PhD for redOrbit.com - Your Universe Online White dwarfs – small balls of carbon and oxygen, the core remnants of Sun-like stars that reached the ends of their lives – give off a soft glow of light, slowly fading as the heat from their surfaces escapes into the coldness of space. These dead cores will eventually dim and cool, as nuclear fusion has long ceased. However, there are some that live on. These white dwarfs orbit in close binary systems with another star. If...

Why Do Quenched Galaxies Seem To Keep Growing?
2013-08-02 04:02:20

redOrbit Staff & Wire Reports - Your Universe Online Thanks to new data obtained from the Hubble Cosmological Evolution Survey (COSMOS), researchers have solved the mystery as to why some galaxies appear to grow larger even after they no longer form new stars. Once galaxies reach a point in their lives when they cease star formation, they are known as "quenched" galaxies, report the authors of the new study. Quenched galaxies in the distant past appear to be much smaller than those...

Life Of Eskimo Nebula Coming To A Beautiful End
2013-07-13 08:19:42

April Flowers for redOrbit.com - Your Universe Online At the end of their lives, stars like our Sun become remarkably photogenic. For example, NGC 2392, located approximately 4,200 light years from Earth, is giving astronomers a beautiful display as it nears the end of its existence. NGC 2392, referred to as a "planetary nebula," has been nicknamed the Eskimo Nebula; however "planetary nebula" is misleading because nebulae have nothing to do with planets. Rather, the term is an...

Monstrous Stellar Collisions Not Expected To Occur Anytime Soon
2013-07-11 14:32:31

Lee Rannals for redOrbit.com - Your Universe Online Astrophysicists from the Astronomical Observatory of the Faculty of Physics at the University of Warsaw say the next collision of monstrous stars will not occur until billions of years from now. Three years ago, scientists discovered that the Magellanic Clouds host gigantic stars with between 200 and 300 times the solar mass  of our own Sun. Before then, astronomers believed that the biggest stars in the Universe did not...

Nature's Constants Not Constant
2013-07-05 08:29:31

Lee Rannals for redOrbit.com - Your Universe Online An international team of astronomers wrote in the journal Physical Review Letters they were able to test a controversial theory about the constants of nature. The team studied a distant white dwarf star using the Hubble Space Telescope to measure the strength of the electromagnetic force, or alpha, one of the four fundamental forces that shape the universe as we know it. The researchers hoped to determine whether the laws of physics...

Stellar Collision Survivor New Type Pulsating Star
2013-06-28 14:54:18

Lee Rannals for redOrbit.com - Your Universe Online Astronomers have discovered that the brightness of the remnant of a stellar collision can vary in a way that scientists have not observed before. The team wrote in the journal Nature that these observations will allow astronomers to learn what happens when stars collide in binary systems. Stars like our Sun expand to become red giant stars when the hydrogen that fuels the nuclear fusion in their cores runs out. Binary stars will...

Computer Simulations Shed New Light On Neutron Star Formation
2013-06-28 04:30:08

redOrbit Staff & Wire Reports - Your Universe Online Researchers from the Max Planck Institute for Astrophysics (MPA) have, for the first time, created three-dimensional computer models in order to study the formation of neutron stars at the center of collapsing stars, officials from the German research center announced earlier this week. By creating what they call the most expensive and elaborate computer simulations of the process to date, the team of investigators confirmed,...

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...

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...

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...

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...

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
  • The hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed.
This word comes from the Greek 'endon,' in, within, plus the Greek 'karpos', fruit.