Which of the following best describes the principle advantage of CCDs over photographic film?
A) CCDs allow long exposures (e.g., minutes or hours) and film does not.
B) CCDs capture a much higher percentage of the incoming photons than film.
C) CCDs can record the colors of astronomical objects accurately while film cannot.
D) CCDs can be attached to modern telescopes more easily than can photographic film.
Question 2
If Venus once had an ocean, where did it go?
A) It exists as abundant water vapor in the planet's atmosphere.
B) It was lost to space, stripped away by the solar wind.
C) The water broke into hydrogen, which escaped to space, and oxygen, which became trapped in the planet's surface rocks.
D) It exists trapped in the crust but below the surface.
E) It is found in the cooler polar regions, like at the Moon and Mercury.
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