What is the likely source of lunar ice?
A) water that was present when the Moon formed
B) contamination from human exploration of the Moon
C) volcanism earlier in the Moon's history
D) impacts of meteoroids and comets
Question 2
Given that the planet orbiting the nearby star 51 Pegasi is about 20X larger than the Earth, but 400X more massive, on that world you would weigh:
A) the same as you do here.
B) twice as much as you do here.
C) half as much as you do here.
D) 20X more that you do here.
E) 400X more than you do here.
Lunar Phases
Shortly after his death, George Washington had already become myth—part Moses, part angel—in this wo
This internal bypass passage in the thermostat housing directs cold coolant to the water pump.
Measles rash. (© Lowell Georgia/Science Source/Photo Researchers, Inc.)
Distribution of Earth's Water
Water as a Polar Molecule