Author Question: Upon what data do measurements of sizes of eclipsing binaries depend? A) their orbital periods ... (Read 18 times)

lindiwe · **on:** Jul 27, 2018

Upon what data do measurements of sizes of eclipsing binaries depend?

A) their orbital periods and separations
B) their masses and luminosities
C) their Doppler shifts and durations of stages of their eclipses
D) their temperatures and speeds
E) their temperatures and masses

Question 2

The chief erosive agent now on the Moon is:

A) lunar ice melting and refreezing in the polar regions.
B) lava flows welling up in the mare.
C) volcanic vents in the rugged highlands.
D) the rain of micrometeorites chewing up the regolith.
E) rain from cometary debris melting as it enters the Moon's atmosphere.