Significant amounts of liquid water last existed on the surface of Mars during the
A) Noachian Era
B) Amazonian Era
C) Hadean Era
D) Hesperian Era
D
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The point in Earth's orbit where Earth is farthest from the Sun is known as
a. aphelion. b. perihelion. c. precession. d. the winter solstice. e. a and d.
Solenoid: Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire windings. If the length of the solenoid becomes twice as long (to 2L), but all other quantities remained the same, the magnetic field inside the solenoid will
A. remain the same. B. become twice as strong as initially. C. become one-half as strong as initially. D. become four times as strong as initially. E. become one-fourth as strong as initially.
Large molecules found in meteorites and interstellar clouds is evidence that:
A) life is abundant in the galaxy. B) life has definitely formed in other places than Earth. C) chemical evolution has taken place elsewhere in the Universe. D) organic molecules are extremely rare. E) life originated on Mars before Earth.
If you had something the size of a sugar cube that was made of white dwarf matter, it would weigh
A) as much as a truck. B) about 5 pounds. C) as much as the entire Earth. D) as much as an average person.