Author Question: Scientists are confident that the Moon does not have a large, dense nickel-iron core because A) ... (Read 168 times)

stock · **on:** Jul 27, 2018

Scientists are confident that the Moon does not have a large, dense nickel-iron core because

A) the Moon's surface rocks are similar in density to the Moon's average density.
B) deep samples taken by the Apollo astronauts found almost no iron.
C) the Earth's magnetic field would pull anything with a lot of iron into the Earth.
D) unmanned Soviet missions drilled into the Moon's core and did not find iron.
E) a thick atmosphere is required for there to be a metal core.

Question 2

A star with a parallax of 1 second of arc is at a distance of ________ by definition.

Fill in the blank(s) with correct word