E) weight per square inch. Closest to the sun and consist of Mercury, Venus, Earth and Mars. the Frost Line). E) Some have satellites of their own. c. the Earth Currently the best theory is the Nebular Theory . Describe the processes that took place according to the solar nebula theory and specifically how it came to be that we have a star and planets rotating around that star and the orbital motion of. (Venus may be an exception, since some claim it is becoming tidally locked to the Sun Mercury is instead locked in a 3:2 resonance and it is in fact now retrograde with a putative near axis lock.) [28][31][68] Some combination of the above-mentioned ideas may explain the formation of the cores of gas giant planets such as Jupiter and perhaps even Saturn. In the farthest area, where the temperature was lower, condensation of matter more similar to that of the star occurred forming the giant or outer gas planets. D) in the Oort Cloud. away from the sun and becomes longest and brightest at perihelion. [72], The region of a planetary system adjacent to the giant planets will be influenced in a different way. Objects in the Kuiper belt The planet will probably have a radius of around five to 10 times greater than Earth's. III. The main issue was angular momentum distribution between the Sun and planets, which the nebular model could not explain. d. a large meteorite impact [21] The formation of planets like Uranus and Neptune is more problematic, since no theory has been capable of providing for the in situ formation of their cores at the distance of 2030AU from the central star. [76] The in situ formation of closely orbiting super-Earths would require a massive disk, the migration of planetary embryos followed by collisions and mergers, or the radial drift of small solids from farther out in the disk. Then the accumulation of matter continues, which will lead to the onset of nuclear reactions that allow the newly formed star to resist gravitational pressure. What is true about solar system densities? Describe two ways of detecting extrasolar planets. B) the great nebula found just below the belt stars of Orion. b. everything past Mars and the asteroid belt Meteorites are important because_ Cometary dust tails lag behind the bluish ion tails as the comet rounds the Sun. Solar wind from the Sun created the heliosphere and swept away the remaining gas and dust from the protoplanetary disc into interstellar space, ending the planetary formation process. But the dust and gas are also the ingredients for the planets themselves. There are several methods that can be used to aid this observance. succeed. [79], Use of the term "accretion disk" for the protoplanetary disk leads to confusion over the planetary accretion process. bodies found beyond Neptune. These stars have powerful solar winds. Density is defined as In 1755 the German philosopher Immanuel Kant suggested that a nebula in slow rotation, gradually pulled together by its own gravitational force and flattened into a spinning disk, gave birth to the Sun and planets.
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