Author Question: The Hubble law is one of the most important relations in modern astronomy because it ____. a. ... (Read 187 times)

melina_rosy · **on:** Jul 27, 2018

The Hubble law is one of the most important relations in modern astronomy because it ____.

a. allows astronomers to measure the distance to very distant galaxies using only their spectrum
b. explains the difference in the types of galaxies seen in different directions
c. relates the rotation curve of a galaxy to the amount of dark matter it contains
d. connects the mass of a spiral galaxy's bulge to the size of its central black hole
e. determines the mass of a cluster using the rotation period of the galaxies it contains

Question 2

What is so unique about the mirrors of telescopes such as the Keck Observatory, Gran Telescopio Canaries and the soon-to-be-built Giant Magellan Telescope?

a. The mirrors are made of a newly designed metallic material.
b. The mirrors can fold up went not in use.
c. The mirrors are inexpensive.
d. The mirrors are segmented.
e. The mirrors are thin.