Multiple Choice
The observational fact about a Cepheid variable star that leads to a measurement of its distance from Earth is that its period of variation is directly related to its
A) absolute magnitude or luminosity.
B) apparent magnitude.
C) speed away from us,using the relativistic effect upon pulsation period.
D) surface temperature.
Correct Answer:
Verified
Correct Answer:
Verified
Q2: What is the Tully-Fisher relation?<br>A) The more
Q3: What percentage of the mass required by
Q4: Which of the following fundamental astronomical questions
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