If you can see it, its a star.
Protostars radiate only in the infrared.
A protostar. See related question.
A rotating nebula (a cloud of gas and dust) collapses under gravity. This creates a lot of heat energy. A "protostar" forms, before nuclear fusion begins. When the core temperature is high enough, hydrogen nuclei can undergo fusion and become helium, releasing nuclear energy. So, eventually the protostar becomes a "true" star and reaches the Main Sequence on the HR diagram. The newly forming star has its greatest luminosity during the earlyprotostar stage. (The protostar has a much bigger surface area than the final star.)
Wiktionary: "Prototypical; preceding the proper beginning of something". That sounds about right, for a protostar.
do you mean star, or act? if you meant star, no. i dont know the answer if you meant act.
This is a very good question. And the short answer would be YES. Actually much more has to occur before nuclear fusion takes place in order to create a full star, but yes this is the beginning of the process. Remember "KEEP LOOKING UP." :)
A protostar is more like a stage previous to a star - before it ignites.
No, a protostar is basically the BEGINNING of a star's life cycle.
Protostar
A baby star is a newborn star. It is called "protostar."
A star that is forming is called a protostar.
The term is "protostar", not "prostar". Yes. A protostar is an early stage of a star.
protostar
Yes
No one. It comes from the Greek - proto - meaning first. So first star - a protostar.
trapping of thermal energy inside the protostar
A star is called a protostar before it begins nuclear fusion in its core and officially becomes a star. During this stage, a protostar is formed from a collapsing cloud of gas and dust, as gravity pulls material together and heats up the core.
Protostar