Definition of protostar in English:

protostar

Line breaks: proto|star
Pronunciation: /ˈprəʊtəʊstɑː
 
/

noun

Astronomy
A contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun.
More example sentences
  • Elongated chains of dust grains like these appear in the early stages of planet formation around a young protostar, according to a microgravity experiment inside a rocket.
  • By peering in wavelengths not visible to the naked eye, through the nebula's gas and dust, astronomers can identify very young stars and even protostars - those that are about to light up, once the gases reach a critical density.
  • Rotation forces some of the matter to accumulate in a disk rotating around the protostar (s).

Definition of protostar in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day fioritura
Pronunciation: fɪˌɔːrɪˈt(j)ʊərə
noun
an embellishment of a melody...