What can trigger the gravitational collapse of an interstellar gas cloud?
A) a decrease in temperature
B) an increase in density
C) a rise in temperature
D) A and B
E) A and C
D
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For a metal with the indicated structure, which of these is not the shortest Burger’s vector in the indicated metal crystal structure?
In active galaxies, their central engines may be temporarily fed by:
A) a sudden surge of star formation. B) a series of supernovae around the core. C) the sudden collapse of the core into a supermassive black hole. D) a close encounter with a neighbor galaxy. E) the fusion of helium into carbon in their cores.
The temperature of the Sun's interior is estimated to be about how many kelvins?
a. 1500 b. 15 million c. 5 billion d. 60,000
Which of the following is the correct electron dot structure for carbon (atomic no. = 6)?
A) a B) b C) c D) d E) e