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 widely accepted modern variant of the nebular hypothesis is Solar Nebular Disk Model (SNDM) or simply Solar Nebular Model. According to SNDM stars form in massive and dense clouds of molecular hydrogen—giant molecular clouds (GMC). They are gravitationally unstable, and matter coalesces to smaller denser clumps within, which then proceed ...
The birth of the modern, widely accepted hypothesis of planetary formation, the Solar Nebular Disk Model (SNDM), can be traced to the works of Soviet astronomer Victor Safronov. [31] His book Evolution of the protoplanetary cloud and formation of the Earth and the planets , [ 32 ] which was translated to English in 1972, had a long-lasting ...
Circumstellar discs HD 141943 and HD 191089.The bottom images are illustrations of above real images. [1]A circumstellar disc (or circumstellar disk) is a torus, pancake or ring-shaped accretion disk of matter composed of gas, dust, planetesimals, asteroids, or collision fragments in orbit around a star.
The actual temperature and distance for the snow line of water ice depend on the physical model used to calculate it and on the theoretical solar nebula model: this tells us nothing for the temperature in degrees 170 K at 2.7 AU (Hayashi, 1981) [4] 143 K at 3.2 AU to 150 K at 3 AU (Podolak and Zucker, 2010) [5] 3.1 AU (Martin and Livio, 2012) [6]
Artist's conception of a protoplanetary disk. The Solar System is believed to have formed according to the nebular hypothesis, first proposed in 1755 by Immanuel Kant and independently formulated by Pierre-Simon Laplace. [2] This theory holds that 4.6 billion years ago the Solar System formed from the gravitational collapse of a giant molecular ...
The main problem is the mechanism of angular momentum transport from the inner to the outer part of the disk, which is necessary for efficient accretion by the protostar. - umm, this needs to be in plainer english or explained a little; As the envelope's material infalls onto the disk - infalls is ungainly. Try 'falls' or 'settles' or somesuch.
Viktor Sergeevich Safronov (Russian: Ви́ктор Серге́евич Сафро́нов) (born Velikie Luki; 11 October 1917 in Russia – 18 September 1999 in Moscow, Russia) was a Soviet astronomer who put forward the low-mass-nebula model of planet formation, a consistent picture of how the planets formed from a disk of gas and dust around the Sun.