Author Question: The absolute magnitude of a star is its brightness as seen from a distance of A) one million ... (Read 30 times)

cartlidgeashley · **on:** Jul 27, 2018

The absolute magnitude of a star is its brightness as seen from a distance of

A) one million kilometers.
B) one astronomical unit.
C) one light-year.
D) ten parsecs.
E) 10 light-years.

Question 2

A late collision with a large planetesimal may have caused what feature on Mars?

A) Olympus Mons
B) its curious north-south asymmetry
C) Hellas Basin
D) the Marianas Trench
E) its exceptionally large nickel-iron core