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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.
In 1960, 1963, and 1978, [13] W. H. McCrea proposed the protoplanet hypothesis, in which the Sun and planets individually coalesced from matter within the same cloud, with the smaller planets later captured by the Sun's larger gravity. [8] It includes fission in a protoplanetary nebula and excludes a solar nebula.
The most significant criticism of the hypothesis was its apparent inability to explain the Sun's relative lack of angular momentum when compared to the planets. [5] However, since the early 1980s studies of young stars have shown them to be surrounded by cool discs of dust and gas, exactly as the nebular hypothesis predicts, which has led to ...
A portion of the theory stating that smaller objects — planetesimals — gradually collided to build the planets by accretion is still well-regarded. From his theories and other geological evidence he concluded that Earth was much older than assumed by Lord Kelvin (ca 100 million years) at the time. His speculations about the source of energy ...
The hypothesis was based on the idea that a star passed close enough to the sun early in its life to cause tidal bulges to form on its surface, which along with the internal process that leads to solar prominences, caused material to be ejected repeatedly from the sun. Due to the gravitational effects of the passing star, two spiral-like arms ...
The innermost planet takes about nine days to orbit the star. The outermost planet takes about 54 days. The planets orbit the star between 6% and 20% of the distance between Earth and the sun.
Based on recent computer model studies, the complex organic molecules necessary for life may have formed in the protoplanetary disk of dust grains surrounding the Sun before the formation of the Earth. [20] According to the computer studies, this same process may also occur around other stars that acquire planets. [20]
Meade's bizarre and unfounded theory claims that immediately after the upcoming total solar eclipse on August 21, the mythical planet Nibiru, or Planet X, will appear on the horizon and begin it's ...