Author Question: Mercury's smooth plains are probably the oldest parts of the crust. Indicate whether the ... (Read 53 times)

asd123 · **on:** Jul 27, 2018

Mercury's smooth plains are probably the oldest parts of the crust.

Indicate whether the statement is true or false

Question 2

The unified model describes active galactic nuclei using

a. a super massive black hole at the center of a normal spiral galaxy.
b. a super massive black hole surrounded by an accretion disk and dense disk of gas.
c. an accretion disk around a neutron star.
d. gravitational lenses to intensify the radiation coming from them.
e. different lines of sight toward and dwarf irregular galaxy.