Of the billions of possible combinations of atoms into organic molecules, only about 1500 actually occur.
Indicate whether the statement is true or false
Question 2Mars' magnetic field is so weak because:
A) it spins much slower than Earth does.
B) it core may no longer be molten.
C) its core contains less iron than our own.
D) Both B and C are probable.
E) All of the above are correct.
Question 3While our two companions, the Magellanic Clouds, are irregulars, Andromeda's two companions, M-32 and M-110, are dwarf ellipticals.
Indicate whether the statement is true or false
Question 4What is the most likely reason that there are no giant planets beyond Neptune?
A) Any planets forming beyond Neptune would have drifted out of the solar system due to the weakness of the Sun's gravity at this distance.
B) There was no material to create planetesimals beyond the orbit of Neptune.
C) By the time planetesimals grew to a large enough mass to hold onto an atmosphere, the solar nebula had been blown away.
D) Any planet forming beyond Neptune's orbit would have been scattered outside of the solar system by gravitational encounters.
E) There may be, but they would be so faint that astronomers have not found them yet.
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