Protoplanetary disc
Protoplanetary disc A proplyd forming in the Orion Nebula. The protoplanetary disk HH-30 in Taurus, about 450 ... a common structure of these formations. A protoplanetary disc (or proplyd) is an accretion disc ...
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Accretion disc
Accretion disc Artist's conception of a binary star ... and one main sequence star An accretion disc (or accretion disk) is a structure formed ... the rotating cloud to collapse into a disc, and tidal effects will tend to align this disc's rotation with the rotation of the ... source in the middle. Viscosity within the disc generates heat and saps orbital momentum, ...
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T Tauri star
... the transfer of angular momentum to the protoplanetary disc. This causes an increased rate of lithium ... disks, which in this case are called protoplanetary disc because they are probably the progenitors of ... gets transferred from the star to the protoplanetary disc. A hypothesised T Tauri stage ...
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List of astronomical topics
... Absolute date Absolute magnitude Accelerating universe Accretion disc Accretion disk Achernar Achondrite Achromatic doublet Achromatic ... Age of the Universe AIPS Airglow Airy disc Airy, George Aitken, Robert Al Sufi Al ... radiation Dingle, Herbert Dione (moon) Dirac, Paul Disc (galaxy) Dispersion (optics) Diurnal motion Dmitri Maksutov ... star Proton-antiproton imbalance Proton-proton chain Protoplanetary disc Protoplanetary disk Protostar Protostellar disk Provisional ...
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History of Earth
... tick. Origin Artist's impression of a protoplanetary disc forming around a binary star system. Main ... and inertia flattened the cloud into a disc, perpendicular to its axis of rotation. Most ... around dust particles, the rest of the disc started to break up into rings. Small ... out most of the material in the disc that had not already condensed into ...
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Beta Pictoris
... and detailed observations reveal a large circumstellar disc, often considered to be a protoplanetary disc. The disc extends 400 AUs away from Beta Pictoris ... planet, orbiting the star and causing the disc's odd behaviour; however, the existence ...
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90377 Sedna
... inner Oort cloud object, situated in the disc reaching from the Kuiper belt to the ... not match the characteristics of Sedna plutino protoplanetary disc – Sedna's orbit appears to imply ... 2005 FY 9 | 2002 AW 197 Scattered disc: 2003 UB 313 | 2004 XR 190 | Sedna† ... Comets | Trans-Neptunians (Kuiper belt � Scattered disc � Oort cloud) For other objects ...
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Solar nebula
Solar nebula A planetary disc forming in the Orion Nebula. In cosmogony ... nebula is the gaseous cloud or accretion disc from which Earth's solar system is ... collapse upon itself, instead forming a disk. Protoplanetary discs emerged in orbit around the protosun ... the Sun in the form of a disc, forces of differential rotation would have prevented ...
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Asteroid
... are believed to be remnants of the protoplanetary disc which were not incorporated into planets during ... Comets | Trans-Neptunians (Kuiper belt � Scattered disc � Oort cloud) For other objects and ... Other: Sun - Asteroid belt - Kuiper belt - Scattered disc - Oort cloud See also astronomical objects and ...
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Talk:Planetesimal
... article indicates that planetetesimals form the protoplatentery disc, but the Protoplanetary disc article indicates that its the other way ...
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