Why are molecular lines more complex than elemental spectral lines?
A) Molecules have two or more atoms.
B) Molecules can vibrate and rotate as well.
C) Molecules are heavier than atoms.
D) Molecules are the basis of life.
E) Most of the universe is made of molecules, not individual atoms.
Question 2Which relationship concerning the mass of protostars is FALSE?
A) The more massive ones will reach the main sequence first.
B) The more massive ones will be the hottest and most luminous.
C) The more massive ones one will be made of the heaviest elements.
D) The more massive ones are so luminous they ionize the gas, hence red H II regions.
E) The more massive ones create a lot of ultraviolet as well as visible light.
Question 3Which of the following is not true of Mercury?
A) It has many moons.
B) At any given time, about half the planet is colder than Antarctica.
C) Its surface is heavily cratered.
D) Mercury has essentially no atmosphere.
Question 4Halley's comet is named after the English scientist Edmund Halley because he
A) discovered it.
B) was the first to see it in 1682.
C) calculated its orbit and predicted that it would return in 1758.
D) was the most famous astronomer in England during its appearance.
E) was the first to publish pictures of it and report it to the International Astronomical Union (IAU).
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