How do we learn the chemical composition of the interstellar medium?
A) We make an educated guess based on the Sun's composition.
B) By studying spectra of interstellar gas clouds.
C) We collect samples of gas and dust from interstellar space.
D) We use computer simulations of the interstellar medium.
B
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Dimensional Analysis: When subtracting several quantities
A. the quantities can have any combination of units. B. the quantities must all have exactly the same units. C. the quantities must all be dimensionless.
Which moon of Saturn shows the largest impact crater, relative to its size?
A) Miranda B) Mimas C) Titan D) Enceladus E) Callisto
If you are standing on the Moon and release a strong balloon filled with helium gas, the balloon will
1) rise. 2) fall. 3) neither rise nor fall. This occurs because 4) helium gas is lighter than air. 5) the Moon does not have an atmosphere. 6) gravity is weaker on the Moon.
The Northern Hemisphere is warmer in its summer months because ________.
A. Earth is closer to the Sun during this time and the Sun is in the sky for a longer period of time B. Earth is closer to the Sun during this time C. the Sun is in the sky for a longer period of time and the Sun is more directly overhead during this time D. the Sun is more directly overhead during this time E. the Sun is in the sky for a longer period of time