Where does a 1-solar-mass protostar appear on an H-R diagram?
A) to the right of the main sequence, and lower down than the Sun
B) to the right of the main sequence, and higher up than the Sun
C) to the left of the main sequence, and higher up than the Sun
D) Nowhere—only stars that have fusion in their cores can be shown on H-R diagrams.
Answer: B