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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.
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 ...
Image Name Other designation Date discovered Distance 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 ...
Diagram of the early Solar System's protoplanetary disk, out of which Earth and other Solar System bodies formed. The Solar System formed at least 4.568 billion years ago from the gravitational collapse of a region within a large molecular cloud. [b] This initial cloud was likely several light-years across and probably birthed several stars. [14]
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.
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.
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 ...
English: An Euler diagram showing the IAU Executive Committee conception of the relationship between objects in the Solar System. The central star has been excluded. Also excluded are artificial satellites. Cosmic dust found within the Solar System falls under two categories depicted here: Small Solar System bodies and natural satellites.