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2. Protoplanetary disk - Wikipedia

   en.wikipedia.org/wiki/Protoplanetary_disk

   A protoplanetary disk is a rotating circumstellar disc of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star. The protoplanetary disk may not be considered an accretion disk ; while the two are similar, an accretion disk is hotter and spins much faster.

3. 2MASS J04202144+2813491 - Wikipedia

   en.wikipedia.org/wiki/2MASS_J04202144+2813491

   2MASS J04202144+2813491 (also known as Tau 042021) [3] [6] is an edge-on protoplanetary disk in the Taurus Molecular Cloud. [3]The star is hidden behind the edge-on disk. Early estimates found that it has a mass of 0.272 ±0.009 M ☉, [7] but a later study did find a higher mass of 0.3–0.4 M

4. List of resolved circumstellar disks - Wikipedia

   en.wikipedia.org/wiki/List_of_resolved_circum...

   Only some are transitional disks between protoplanetary and debris. ... This list only contains a selection of disks with d<2 arcsec. Name Image RA (J2000)

5. Planetesimal - Wikipedia

   en.wikipedia.org/wiki/Planetesimal

   Planetesimals (/ ˌ p l æ n ɪ ˈ t ɛ s ɪ m əl z /) are solid objects thought to exist in protoplanetary disks and debris disks. Believed to have formed in the Solar System about 4.6 billion years ago, they aid study of its formation.

6. HD 141569 - Wikipedia

   en.wikipedia.org/wiki/HD_141569

   In January 1999, NASA announced a protoplanetary disk around HD 141569. The Hubble Space Telescope showed that the disk appears to come in two parts (inner and outer). It superficially resembles the largest gap in Saturn's rings (known as the Cassini division). The vast disk is 75 billion miles across (13 times the diameter of Neptune's orbit ...

7. Nebular hypothesis - Wikipedia

   en.wikipedia.org/wiki/Nebular_hypothesis

   Thus the formation of planetary systems is thought to be a natural result of star formation. A Sun-like star usually takes approximately 1 million years to form, with the protoplanetary disk evolving into a planetary system over the next 10–100 million years. [2] The protoplanetary disk is an accretion disk that feeds the central star. [3]

8. PDS 70 - Wikipedia

   en.wikipedia.org/wiki/PDS_70

   The protoplanetary disk around PDS 70 was first hypothesized in 1992 [14] and fully imaged in 2006 with phase-mask coronagraph on the VLT. [2] The disk has a radius of approximately 140 au . In 2012 a large gap (~ 65 au ) in the disk was discovered, which was thought to be caused by planetary formation.

9. Protoplanet - Wikipedia

   en.wikipedia.org/wiki/Protoplanet

   A protoplanet is a large planetary embryo that originated within a protoplanetary disk and has undergone internal melting to produce a differentiated interior. Protoplanets are thought to form out of kilometer-sized planetesimals that gravitationally perturb each other's orbits and collide, gradually coalescing into the dominant planets .