Multiple Choice
Dust reddens starlight because
A) it re-emits the light it absorbs at red wavelengths.
B) it emits mostly in the infrared due to its cold temperature.
C) it is made mostly of hydrogen,which produces the red Halpha emission line.
D) it preferentially affects light at optical and shorter wavelengths.
Correct Answer:
Verified
Correct Answer:
Verified
Q11: Why is it possible for self-gravity to
Q15: How are Herbig-Haro objects related to T
Q17: Star formation is a quiet and tranquil
Q18: "Weather" in the interstellar medium is produced<br>A)
Q19: A protostar is usually in hydrostatic equilibrium
Q21: The source of energy for a contracting
Q24: If a <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB4068/.jpg" alt="If a
Q25: The most common types of stars in
Q26: When a molecular cloud fragments and stars
Q27: A protostar's evolutionary "track" in the H-R