Search results
Results from the WOW.Com Content Network
The widely accepted modern variant of the nebular theory is the solar nebular disk model (SNDM) or solar nebular model. [1] It offered explanations for a variety of properties of the Solar System, including the nearly circular and coplanar orbits of the planets, and their motion in the same direction as the Sun's rotation.
The Solar System travels alone through the Milky Way in a circular orbit approximately 30,000 light years from the Galactic Center. Its speed is about 220 km/s. The period required for the Solar System to complete one revolution around the Galactic Center, the galactic year, is in the range of 220–250 million years. Since its formation, the ...
As this collapsing cloud, called a solar nebula, becomes denser, random gas motions originally present in the cloud average out in favor of the direction of the nebula's net angular momentum. Conservation of angular momentum causes the rotation to increase as the nebula radius decreases. This rotation causes the cloud to flatten out—much like ...
In astronomy or planetary science, the frost line, also known as the snow line or ice line, is the minimum distance from the central protostar of a solar nebula where the temperature is low enough for volatile compounds such as water, ammonia, methane, carbon dioxide and carbon monoxide to condense into solid grains, which will allow their accretion into planetesimals.
A protoplanetary nebula or preplanetary nebula [1] (PPN, plural PPNe) is an astronomical object which is at the short-lived episode during a star's rapid evolution between the late asymptotic giant branch (LAGB) phase and the subsequent planetary nebula (PN) phase. A PPN emits strongly in infrared radiation, and is a kind of reflection nebula.
Boomerang Nebula: Centaurus Bipolar Nebula 1980 5,000 Calabash Nebula: OH231.8+4.2 1786 4,200 Egg Nebula: CRL 2688 1996 3,000 Frosty Leo Nebula: IRAS 09371+1212 1976 3,000 Red Rectangle Nebula: HD 44179 1973 2,300 ± 300 Cotton Candy Nebula: IRAS 17150-3224 Water Lily Nebula: IRAS 16594-4656 1999 IRAS 22036+5306: 6,500 Westbrook Nebula: IRAS ...
As of July 2003, the accepted value for the deuterium abundance is (2.25 ± 0.35) × 10 −5, [1] which probably represents the primordial value in the protosolar nebula that gave birth to the Solar System. [29]
Planetesimals that have survived to the current day are valuable to science because they contain information about the formation of the Solar System. Although their exteriors are subjected to intense solar radiation that can alter their chemistry, their interiors contain pristine material essentially untouched since the planetesimal was formed.