Where did the Apollo 15 lunar module land and sample?
a. Taurus-Littrow region
b. Oceanus Procellarum
c. Mare Tranquillitatis
d. Hadley Rille
e. Descartes region
d
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Some Seyfert nuclei emit more energy than the energy emitted by the entire Milky Way Galaxy
Indicate whether the statement is true or false
When the Sun runs out of nuclear fuel and expands to become a red giant,
A) the Earth's oceans will freeze solid B) the Earth will be ejected from the solar system C) the Earth will be destroyed D) the Earth will experience a runaway greenhouse effect followed by the total loss of its atmosphere
Capacitors in Combination: A potential difference of V = 100 V is applied across two capacitors in series, as shown in the figure. If C1 = 10.0 ?F and the voltage drop across it is 75 V, what is the capacitance of C2? 
A. 30 ?F B. 2.5 ?F C. 7.5 ?F D. 3.3 ?F
The rings of Neptune
A) were confirmed by the Voyager 2 in 1989. B) number five, with three narrow, two more diffuse. C) all lie within Neptune's Roche Limit. D) often appear as clumpy ring arcs, rather than complete and symmetrical. E) All of these are correct.