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By 10 million years, gas in the protoplanetary disc has been blown away, and outer planet formation is likely complete. [38] 10 million – 100 million years 4.5–4.6 bya: Terrestrial planets and the Moon form. Giant impacts occur. Water delivered to Earth. [2] Main sequence 50 million years 4.5 bya: Sun becomes a main-sequence star. [32] 200 ...
French philosopher and mathematician René Descartes was the first to propose a model for the origin of the Solar System in his book The World, written from 1629 to 1633.. In his view, the universe was filled with vortices of swirling particles, and both the Sun and planets had condensed from a large vortex that had contracted, which he thought could explain the circular motion of the plane
In this model giant planet formation is divided into two stages: a) accretion of a core of approximately 10 M E and b) accretion of gas from the protoplanetary disk. [2] [22] [67] Either method may also lead to the creation of brown dwarfs. [31] [68] Searches as of 2011 have found that core accretion is likely the dominant formation mechanism. [68]
A planet's year depends on its distance from its star; the farther a planet is from its star, the longer the distance it must travel and the slower its speed, since it is less affected by its star's gravity. No planet's orbit is perfectly circular, and hence the distance of each from the host star varies over the course of its year.
An artist's concept of a planetary system. A planetary system is a set of gravitationally bound non-stellar bodies in or out of orbit around a star or star system.Generally speaking, systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, comets, planetesimals [1] [2] and ...
The term 'dwarf planet' arguably contains two words, a noun (planet) and an adjective (dwarf). Thus, the term could suggest that a dwarf planet is a type of planet, even though the IAU explicitly defines a dwarf planet as not so being. By this formulation therefore, 'dwarf planet' and 'minor planet' are best considered compound nouns.
The Ministry of Science and Technology (MOST, Vietnamese: Bộ Khoa học và Công nghệ) is a government ministry in Vietnam responsible for state administration of science and technology activities; development of science and technology potentials; intellectual property; standards, metrology and quality control; atomic energy, radiation and nuclear safety.
An experimental Wikipedia edition in the obsolete chữ Nôm script began in October 2006 at the Wikimedia Incubator. [6] It was deleted in April 2010. [7] [non-primary source needed] The Vietnam Wikimedians User Group supports the development of the Vietnamese Wikipedia and other Vietnamese-language Wikimedia projects.