Quantcast

Latest Circumstellar discs Stories

Study Sheds Light On Planetary Orbital Pile-Ups
2012-03-20 08:32:57

Researchers said they have found why some orbits seen in young solar systems seem to be more popular than others. Astronomers have been puzzled as to why giant gas planets like Jupiter and Saturn appear to occupy certain regions in mature solar systems while staying clear of others. Ilaria Pascucci, an assistant professor at the University of Arizona's Lunar and Planetary Laboratory, said the final distribution of planets does not vary smoothly with distance from the star, but has clear...

A New Take On Planetary Accretion
2012-02-29 09:39:21

The prevailing model for planetary accretion, also called fractal assembly, and dating back as far as the 18th century, assumes that the Solar System´s planets grew as small grains colliding chaotically, coalescing into bigger ones, colliding yet more until they formed planetesimals. The planetesimals then collided until they formed planets as varied as the Earth and Jupiter. The model assumes that this occurred in an extremely hot (as high as 1,600 degrees Celsius) environment for...

Spitzer Detects Signs Of Ice Bodies In Alien Solar System
2011-10-19 12:16:49

NASA said on Wednesday that its Spitzer Space Telescope has detected signs of icy bodies raining down in an alien solar system. The telescope spotted a band of dust around a nearby bright star in the northern sky called Eta Corvi that matches the contents of an obliterated giant comet. The space agency said the dust is located close enough to Eta Corvi that Earth-like worlds could exist, which suggest a collision took place between a planet and one or more comets. The Eta Corvi...

dd7fd45f84604d1740b5e9337e700dca1
2011-03-05 10:45:00

Astronomy & Astrophysics is publishing new observations of the giant planet around ÃŽ² Pictoris. Discovered in 2009, this planet, called ÃŽ² Pictoris b, has now been detected again with the NaCo instrument on the VLT. Astronomers find that the planet is moving around the star. They have also measured the mass and the effective temperature of ÃŽ² Pic b.Astronomy & Astrophysics publishes new high angular resolution observations of the...

2011-03-03 23:21:28

Nanoprobe reveals life history of meteorite from early solar system Scientists have performed a micro-probe analysis of the core and outer layers of a pea-sized piece of a meteorite some 4.57 billion years old to reconstruct the history of its formation, providing the first evidence that dust particles like this one experienced wildly varying environments during the planet-forming years of our solar system. The researchers interpret these findings as evidence that dust grains traveled over...

2011-03-03 14:49:00

HOUSTON, March 3, 2011 /PRNewswire-USNewswire/ -- NASA research on a meteorite has provided new evidence that the inner planets formed from materials spread far and wide in the early solar system, and not just from nearby matter. (Logo: http://photos.prnewswire.com/prnh/20081007/38461LOGO) Oxygen isotopic measurements in the core and outer rim of a calcium-aluminum-rich inclusion contained in the Allende meteorite record the entire range of oxygen isotopic composition previously measured...

13bdcbd3d0bcd9f88c93c2b8e90fc2621
2010-09-23 14:05:00

New supercomputer simulations tracking the interactions of thousands of dust grains show what the solar system might look like to alien astronomers searching for planets. The models also provide a glimpse of how this view might have changed as our planetary system matured. "The planets may be too dim to detect directly, but aliens studying the solar system could easily determine the presence of Neptune -- its gravity carves a little gap in the dust," said Marc Kuchner, an astrophysicist at...

2010-09-23 10:20:00

GREENBELT, Md., Sept. 23 /PRNewswire-USNewswire/ -- New supercomputer simulations tracking the interactions of thousands of dust grains show what the solar system might look like to alien astronomers searching for planets. The models also provide a glimpse of how this view might have changed as our planetary system matured. (Logo: http://photos.prnewswire.com/prnh/20081007/38461LOGO) (Logo: http://www.newscom.com/cgi-bin/prnh/20081007/38461LOGO) "The planets may be too dim to detect...

d15acaa1a09418445c0fa4b2a3cdd31a1
2010-08-23 14:55:00

Tight double-star systems might not be the best places for life to spring up, according to a new study using data from NASA's Spitzer Space Telescope. The infrared observatory spotted a surprisingly large amount of dust around three mature, close-orbiting star pairs. Where did the dust come from? Astronomers say it might be the aftermath of tremendous planetary collisions. "This is real-life science fiction," said Jeremy Drake of the Harvard-Smithsonian Center for Astrophysics, Cambridge,...


Latest Circumstellar discs Reference Libraries

8_2c71772f2c3a31994d5208d4518632494
2004-10-19 04:45:44

Cosmogony -- Cosmogony is the study of the origins of celestial objects. It is most commonly used to refer to the study of the origin of the solar system. Currently, the most widely accepted theory is that the solar system was formed roughly 5 billion years ago with the collapse of a nebula of gas and dust, likely caused by shock waves generated by a nearby supernova. The solar system would have formed as a member of a star cluster, now long-since dispersed throughout the Milky Way over...

4_2263b8f4e602bddd69c225b3bc2c46aa2
2004-10-19 04:45:41

Asteroid Belt -- The Asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. It is believed that, during the first million years of the solar system history, planets formed by accretion of planetesimals. Ripetute collisions led to the familiar rocky planets and to the gas giant's cores. However, in this zone of the system the strong gravity of Jupiter inhibited the final stages...

3_a997defc9ca7ea81c6bd4ed4bab88e3c2
2004-10-19 04:45:40

Vega -- Vega (Alpha Lyrae) is the lead star in the constellation Lyra, reaching near directly overhead the mid-northern latitudes, during the summer. It's a "nearby star" at only 25 light years distant and together with Arcturus and Sirius, one of the brightest stars in the Sun's neighbourhood. Vega is a vertex of the Summer Triangle. Its spectral class is A0V (Sirius, an A1V, is slightly less powerful) and it's firmly in the main sequence, fusing hydrogen to helium in its core....

3_26342a6670b6131c97d5fc3f8796ebd92
2004-10-19 04:45:40

Epsilon Eridani -- Epsilon Eridani is a main-sequence star in the constellation of Eridanus (the river). It is often used in science fiction because it is extremely sunlike, and in the fictional Star Trek universe it is the home sun of the planet Vulcan which is home to Mr. Spock. It is the third closest star visible without a telescope. It has 85% of the Sun's mass, almost that much of its diameter, and 28% of its luminosity. It is 10.5 light years from Earth. Its spectrum is...

More Articles (4 articles) »
Word of the Day
omphalos
  • The navel or umbilicus.
  • In Greek archaeology: A central boss, as on a shield, a bowl, etc.
  • A sacred stone in the temple of Apollo at Delphi, believed by the Greeks to mark the 'navel' or exact center-point of the earth.
'Omphalos' comes from the ancient Greek.
Related