3, Apr 2021
Explain what happens in the protostar and pre-main-sequence stage–what does it start with? What are some of the physical processes that are happening? Include some information about the T-Tauri stage.

Explain what happens in the protostar and pre-main-sequence stage–what does it start with?  What are some of the physical processes that are happening?  Include some information about the T-Tauri stage.