Upon observing a nebula, you discover that many stars are surrounded by disks of gas and dust. What can you conclude about these stars?
A) They are very young.
B) They are very old.
C) They are red giants.
D) They are white dwarfs.

Question

Quizplus · Accepted Answer

These stars are very young, as the disks of gas and dust surrounding them are remnants of the material from which the stars themselves formed. This is a common characteristic of young stars, often referred to as protoplanetary or circumstellar disks, which may eventually coalesce into planets.

Upon Observing a Nebula, You Discover That Many Stars Are