Multiple Choice
Suppose the X-ray signal from a quasar fluctuates with a period of 3 hours. What is the maximum size of the source?
A) 150,000 km, about the diameter of Jupiter
B) 10.8 au, about the diameter of Jupiter's orbit
C) 4.5 ly, about the distance between the Sun and the nearest star
D) 10,800 ly, a tenth the size of the Milky Way Galaxy
Correct Answer:
Verified
Correct Answer:
Verified
Q73: Which of these would NOT necessarily be
Q74: Faint starlike objects producing intense radio energy
Q75: The specific characteristics that identify MOST quasars
Q76: A starlike object seen on deep sky
Q77: Which observation of quasars convinced astronomers that
Q79: Massive black holes have been discovered in
Q80: What is now considered to be the
Q81: The major surprise about Cygnus A, one
Q82: Synchrotron radiation is produced whenever<br>A) electrons jump
Q83: Seyfert galaxies are<br>A) spiral galaxies with bright,