Question

In which region of the Hertzsprung-Russell diagram does a newly formed protostar first appear when it begins to shine at visible wavelengths?

A) bottom right corner; very low luminosity because it is both small and cool
B) center of the main sequence since all protostars begin their lives at this position and move up or down it depending on their mass as time passes
C) right side; relatively large luminosity because of its size but cool
D) top left corner; at the top of the main sequence, down which it will progress with time

Answer 1

A newly formed protostar first appears in the bottom right corner of the Hertzsprung-Russell (H-R) diagram with very low luminosity.

Step-by-step explanation:

A newly formed protostar first appears in the bottom right corner of the Hertzsprung-Russell (H-R) diagram. It has very low luminosity because it is both small and cool. As the protostar starts to shine at visible wavelengths, it moves up or down the main sequence on the H-R diagram depending on its mass.