Protostellar Disk: A gas cloud around a forming star flattened by rotation.
Pulsar: A rapidly rotating neutron star that emits beams of radiation along misaligned magnetic axes.
Q ...
protostellar disk: A gas cloud around a forming star flattened by its rotation.
pulsar: A source of short, precisely timed radio bursts; believed to be a spinning neutron star.
The rationale was that the temperature of protostellar disks increases closer to the star. This means that volatile elements would not condense in the inner solar system.
Some of the dust is ejected out of the protostellar disk in the strong stellar winds that occur during a protostar's active T Tauri phase and may be destroyed when passing through shocks, e.g. in Herbig-Haro objects.
Planets are thought to form from the collapsing nebula that a planet's star formed out of, aggregating from gas and dust that orbits the protostar in a dense protostellar disk before the star's core ignites and its solar wind blows the remaining ...
 See also: Solar System, Disk, Solar, Star, Planet
  
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