01
A protostar is a contracting stellar embryo that has not yet reached long-term hydrogen fusion in its core.
supportedLearn this concept
Turn the idea into understanding.
Knowledge map
See where this idea fits.
Before this
Prerequisites
After this
Builds toward
Evidence first
Verified knowledge behind the lesson.
02
Accreting gas releases gravitational potential energy as heat.
supported03
Infrared surveys detect deeply embedded young stellar objects, while jets produce Herbig-Haro shocks where fast outflows collide with ambient gas.