Planetesimal - Wikipedia
网页A planetesimal is a solid object arising during the accumulation of orbiting bodies whose internal strength is dominated by self-gravity and whose orbital dynamics is not significantly affected by gas drag. This corresponds to objects larger than approximately 1 …
Planetesimal | Astronomy, Solar System & Planet Formation
网页Planetesimal, one of a class of bodies that are theorized to have coalesced to form Earth and the other planets after condensing from concentrations of diffuse matter early in the history of the solar system. According to the nebular hypothesis, part of an interstellar cloud of dust and gas.
Astronomer Explains What is a Planetesimal - Little Astronomy
网页2024年2月4日 · Planetesimals are objects made out of rock and ice that formed during the solar system’s early days. You can think of them as the ancestors of planets or very small versions of a planet. Every planetesimal can become a protoplanet, and later a planet, only a few of them do.
Planetesimals - Universe Today
网页A planetesimal is an object formed from dust, rock, and other materials. The word has its roots in the concept infinitesimal, which indicates an object too small to see or measure....
Planetesimal Hypothesis - HowStuffWorks
网页2024年3月7日 · The Planetesimal Hypothesis suggested planets formed from small bits of matter (planetesimals) revolving around the sun, originating from gases pulled out by a near-collision with a passing star.
Planetesimal rings as the cause of the Solar System’s planetary ...
网页2021年12月30日 · The outermost ring is consistent with dynamical models of Solar System evolution proposing that the early Solar System had a primordial planetesimal disk beyond the current orbit of Uranus.
Contemporary formation of early Solar System planetesimals at …
网页2021年12月22日 · The formation of planetesimals is expected to occur via particle-gas instabilities that concentrate dust into self-gravitating clumps1–3. Triggering these instabilities requires the prior pile ...
Early planetesimal differentiation and late accretion shaped …
网页2024年5月16日 · The relative roles of protoplanetary differentiation versus late accretion in establishing Earth’s life-essential volatile element inventory are being hotly debated.
New Horizons Team Uncovers a Critical Piece of the Planetary ... - NASA
网页2020年2月13日 · Data from NASA’s New Horizons mission are providing new insights into how planets and planetesimals – the building blocks of the planets – were formed.
Formation of Planetesimals: The Building Blocks of Planets
网页2015年1月1日 · The ultimate outcome of the planetesimal formation stage is the production of planetesimals of sufficient sizes to obtain gravitational cross sections much larger than their physical cross sections, hence accelerating the growth toward fully fledged planets.
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