The Hubble Space Telescope has enabled astronomers to explore an active galaxy such as M87 in remarkable detail. Which of the following observations of M87 is NOT an important part of the web of evidence that shows it must have a supermassive black hole at the center?
A) the discovery of a gravitational lens in M87
B) the discovery that the distribution of stars in the galaxy becomes densely concentrated at the center (much more so than in normal elliptical galaxies)
C) the discovery of an inner disk of rapidly swirling gas in the center of the galaxy
D) the Doppler shifts measured for spectral lines coming from rapidly moving gas
E) evidence that M87 may have grown to be a giant elliptical through collisions with other, smaller galaxies, some of whose material may have fallen into M87's center
Correct Answer:
Verified
Q8: A friend of yours who is a
Q9: The astronomer who first solved the problem
Q10: When astronomers make counts of how many
Q11: If quasars are at the distances most
Q12: Astronomers have established that quasars and active
Q14: Which of the following observations is a
Q15: How do astronomers explain the energetic jets
Q16: A distant quasar shows a large redshift
Q17: When quasars "shine" (in visible light and
Q18: If quasars often resemble little blue stars,
Unlock this Answer For Free Now!
View this answer and more for free by performing one of the following actions
Scan the QR code to install the App and get 2 free unlocks
Unlock quizzes for free by uploading documents