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

Physics & Space Science

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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

Physics & Space Science

For a metal with the indicated structure, which of these is not the shortest Burger’s vector in the indicated metal crystal structure?

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science