What eventually halts the gravitational collapse of an interstellar gas cloud that forms an object that is massive enough to become a star?
A) the central object becoming hot enough to sustain nuclear fusion in its core
B) a critical fraction of the gas has been driven further into space
C) nothing; all collapsing gas clouds become black holes
D) the crowding of electrons in the core
A
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The open clusters were a population of relatively young stars, so where would you expect to see them from?
A.) In the halo with globular clusters. B.) In the disk. C.) In the bulge. D.) Only around the Sun. E.) Behind us.
Using graphical techniques, determine the temperature distribution through the concrete slab shown after one hour. The slab is subjected to 10 W/m^2 of heat at the surface, assuming a constant temperature gradient at the surface.
What will be an ideal response?
The critical density of the universe is the
A) total density of matter and energy needed to give the universe a "flat" geometry (in spacetime). B) measured average density of matter in the universe. C) density of matter necessary for stars and galaxies to form. D) density value at which the total density of matter precisely equals the total density of antimatter.
Work is defined as force times
a. distance. b. time. c. parallel distance. d. perpendicular distance.