Compared to the density of water, our Earth averages about
A) the same density, similar to Saturn.
B) 3 times denser, much like our Moon.
C) 4 times denser, similar to Mars.
D) 5 times denser, like the Mercury and Venus.
E) 10 times denser, due to our core of iron and nickel.
Question 2
Two red stars have surface temperatures of 3000 K, but Star A's luminosity is about 5 of the Sun's and Star B's luminosity is about 32,000 times the luminosity of the Sun. How much bigger is star B than star A?
A) They are the same size.
B) Star B's radius is about 16 times larger than star A's radius.
C) Star B's radius is about 800 times larger than star A's radius.
D) Star B's radius is about 640,000 times larger than star A's radius.
E) This cannot be determined from the information given.
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