According to present understanding, a nova is caused by
A) hydrogen fusion on the surface of a white dwarf.
B) carbon fusion in the core of a white dwarf.
C) hydrogen fusion on the surface of a neutron star.
D) a white dwarf that gains enough mass to exceed the 1.4-solar-mass limit.
A
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If the proto star that became our Sun had been hotter and more luminous when it formed, what changes (if any) might have been experienced by our Solar System?
A) The Moon would not exist. B) Jupiter would now be farther from the Sun. C) No comets could have formed. D) Mars would be a gas giant. E) Terrestrial planes could only have formed closer to the Sun.
A hot pizza contains __________
Fill in the blank(s) with correct word
The symbol indicating the number of protons in a nucleus is N
a. True b. False Indicate whether the statement is true or false
This figure shows the motions of atoms (a) in a falling ball and (b) after the ball hits the ground. Why would you not expect the ball on the ground to suddenly move upward?
a. Because it is exceedingly unlikely that the velocities of the atoms would simultaneously reorder themselves to generally point upward. b. It would violate the first law of thermodynamics. c. Both a. and b.