Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective astronomy Of or pertaining to a
protoplanet .
Etymologies
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Examples
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In order to determine whether the surface of an extrasolar planet would contain water, scientists can look at what is called the protoplanetary disk - a disk of gas and dust surrounding a star during its early stages of development.
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In order to determine whether the surface of an extrasolar planet would contain water, scientists can look at what is called the protoplanetary disk - a disk of gas and dust surrounding a star during its early stages of development.
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In order to determine whether the surface of an extrasolar planet would contain water, scientists can look at what is called the protoplanetary disk - a disk of gas and dust surrounding a star during its early stages of development.
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For those of you scoring at home, "planetesimals" were the first solid objects in our newly minted solar system (also known as the protoplanetary disk).
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Now researchers have probed whether or not the necessary precursor to planet formation - a so-called "protoplanetary" disk of planet building blocks - could survive in this environment.
SPACE.com 2010
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There are two proposed mechanisms for the formation of gas giants: (a) formation of a rocky/icy core through collisions of dust particles and a subsequent accretion of a gaseous envelope; (b) gravitational instability of the protoplanetary disk.
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Neither the initial formation of the Sun from a molecular gas cloud, nor the subsequent formation of the planets from the protoplanetary disk was a violent process from the relativistic standpoint: the spacetime remained Newtonian.
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"We need to see through gas and dust to see star formation and protoplanetary disks" – here's Spitzer.
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Besides PSR B1257+12, at least one other pulsar planet is known PSR B1620+26 and a protoplanetary disk was revealed around the magnetar 4U 0142+61.
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Smaller dust grains within the disk capture some of the UV radiation in the early formation periods of a protoplanetary disk.
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Such ‘protoplanetary’ disks are what the environs of the Sun would have been like 4.6 billion years ago, with planets coalescing from the whirling material around an infant star.
How worlds are born: JWST reveals exotic chemistry of planetary nurseries Alexandra Witze 2023
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