The planetesimal (from the English planet - the planet and the English infinitesimal - infinitesimal) is a celestial body in orbit around a protostar , formed as a result of the gradual increment of smaller bodies consisting of dust particles of a protoplanetary disk . By constantly attracting new material to itself and accumulating mass, planetesimals form a larger body. Separate components of it, mutually attracted, begin to condense. An example of planetesimal is the asteroid Lutetium , which has a dense core under a thick kilometer-thick layer of dust [1] .
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The compacting substance increases the temperature in the center. The increased temperature melts it, a protoplanet is formed.
The theory of planet formation, including the so-called “planetesimals hypothesis”, was proposed by the Soviet astronomer V. Safronov [2] [3] and is currently supported by most astronomers of the world [4] [5] [6] .
Literature
- Robert Hazen . Earth History: From Stardust to a Living Planet: The First 4,500,000,000 Years = Robert Hazen. The Story of Earth. The First 4.5 Billion Years, from Stardust to Living Planet. - M .: Alpina Non-fiction, 2017 .-- 364 p. - ISBN 978-5-91671-706-8 .
Notes
- ↑ Lutetia turned out to be planetesimal
- ↑ Safronov V.S. Evolution of a pre-planetary cloud and the formation of the Earth and planets.- M., 1969 (English edition - USA, NASA TTF 677, 1972)
- ↑ Safronov V.S. Origin of the Earth.— M.: Knowledge, 1987
- ↑ From Dust to Planetesimals Archived on September 7, 2006. // Workshop at Ringberg Castle, Germany, September 11-15, 2006.
- ↑ Planetesimal // Astronomical encyclopedic dictionary / Behind the editors І. A. Klimishin and A.O. Korsun. - Lviv, 2003. - S. 357. - ISBN 966-613-263-X . (Ukrainian)
- ↑ Hazen, 2017 , p. 47.