Author Question: Which of the following processes slowed the collapse of protogalactic clouds? A) the conversion ... (Read 45 times)

Collmarie · **on:** Jul 27, 2018

Which of the following processes slowed the collapse of protogalactic clouds?

A) the conversion of gravitational potential energy into kinetic and thermal energy as the cloud collapsed
B) the formation of the first generation of stars
C) the shock waves from the exploding supernovae of the earliest stars
D) the pull of gravity of the mass of the cloud material
E) the radiating away of thermal energy

Question 2

A unique characteristic of type O stars is ionized helium lines in its spectrum.

Indicate whether the statement is true or false