Multiple Choice
The luminosity of a Cepheid star varies in time because
A) the entire star pulsates from its core to its surface.
B) the outer envelope of the star contracts and expands radially.
C) the star rotates too quickly.
D) the star is too massive to be stable.
E) the star undergoes changing chemical reactions on its surface.
Correct Answer:
Verified
Correct Answer:
Verified
Q70: As a high-mass main-sequence star evolves off
Q71: Type Ia and Type II supernovae are
Q72: Iron has 26 protons in its nucleus,
Q73: A neutron star in a mass-transfer binary
Q74: The figure below shows the H-R diagram
Q76: Type I and Type II supernovae can
Q77: Explain why neutron stars are fast-spinning objects
Q78: The main difference between classical Cepheids and
Q79: Supernovae are very energetic events.Of the following
Q80: One reason why we think neutron stars