What could have been habitable if the Sun had been twice as massive?
A: Mercury
B: Venus
C: Jupiter's moons
D: Neptune
E: Pluto
Ans: C: Jupiter's moons
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Mercury's surface, upon casual visual observation, most resembles what other surface in our solar system?
What will be an ideal response?
Who developed the quantum theory in 1900 and has a constant named for him?
a. de Broglie b. Bohr c. Planck d. Einstein
Velocity Addition: You are moving at a speed 2/3 c toward Randy when shines a light toward you. At what speed do you see the light approaching you?
A. 1/3 c B. 2/3 c C. 4/3 c D. c
we imagine the history of the universe compressed into one year, with the present as the stroke of midnight at the very end of that year, dinosaurs became extinct
A) about 6 months ago. B) about 3 weeks ago. C) yesterday morning. D) about an hour ago.