What are the shared common characteristics of the Moon and Mercury?
What will be an ideal response?
Earth's Moon and Mercury are good subjects for comparative planetology. They are similar in a number of ways. Most important, they are small worlds; the Moon is only a fourth of Earth's diameter, and Mercury is just over a third of Earth's diameter. They have negligible atmospheres, their rotation has been altered by tides, their surfaces are heavily cratered, their lowlands are flooded in places by ancient lava flows, and both now have ancient, inactive surfaces.
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The farthest galaxies that astronomers have seen are all elliptical galaxies
a. True b. False Indicate whether the statement is true or false
Buoyancy: A cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. Which one of the following graphs best describes the buoyant force B on this block as a function of time t if the block just enters the water at time t = 0 s?
A. 
B. 
C. 
D. 
E. 
What do asteroids and comets have in common?
A) They are leftover planetesimals from the era of planetary formation. B) They all formed beyond the frost line of the early solar system. C) They have very similar compositions of ice and rock. D) They are all much smaller than any moons.
Explain the significance of the center of gravity
What will be an ideal response?