S1 - Overview

Question 1

_______ are used to detect new, young, forming stars.
_______ shows regions of future star formation.
_______ shows already formed stars.

Answer 1

X-rays are used to detect new, young, forming stars.
Infrared shows regions of future star formation.
Optical shows already formed stars (fully formed stars emit the most in optical wavelengths).

Question 2

What mechanism opposes the inward gravitational force acting on stars in order to prevent collapse?

Answer 2

Thermal pressure

Question 3

What is a protostar?

Answer 3

A central dense object receiving infalling material from its parent molecular cloud.

Question 4

What causes the high amounts of turbulence in nebulae?

Answer 4

Stellar winds, supernova shocks, and collisions with other clouds.

Question 5

Do protoplanetary disks emit optical light and why?

Answer 5

No, due to their low temperature.