Multiple Choice
Herbig-Haro objects, bright, variable regions within nebulae, are now thought to be the result of:
A) the initial condensation of matter into a protostar, producing an infrared and visible glow.
B) intense jets of material ejected from a young star, hitting parts of the nebula.
C) brightening of the gas surrounding a massive star as the precursor to a supernova explosion.
D) the hot atmosphere of a star as it is ejected in the dying phases of the star's life.
Correct Answer:

Verified
Correct Answer:
Verified
Q76: What process makes an emission nebula glow?<br>A)electric
Q77: When a dark nebula collapses to form
Q78: Compared to the air we breathe, how
Q79: Which of the following processes does NOT
Q80: Star clusters of the same type and
Q82: Which of the following is a tightly
Q83: Evidence for the interstellar medium has been
Q84: A T Tauri star is:<br>A)an intermediate mass
Q85: The smallest mass that a main-sequence star
Q86: How large and bright is a young