Which best supports the idea that the surface of the moon has changed very little?

a) if photographs of the moon were taken millions of years ago, the surface would look the same.
b) because the moon does not have a large iron core, it is not possible for geologic events to occur on the moon.
c) because the moon has no atmosphere, it is not possible for geologic events to occur on the moon.
d) if one considers the history of the moon, there is only one distinct phase of its development.

The “death throes” of stars are amongst the most complex phenomena in all of astronomy, and the “corpses” of stars amongst the most energetic and exotic objects in existence. beginning at the end of the core helium fusion stage in a star’s life, describe in detail the post-main sequence development of both (a) a 1.0 solar mass star, and (b) a 25.0 solar mass star. in what significant ways do they differ? what role does each of these types of stars play in the "star-gas-star" cycle and the evolution of chemical elements in our galaxy?

Two vectors are shown. which statement best compares the vectors? vector x has greater magnitude than vector y. vector y has greater magnitude than vector x. the vectors have the same displacement. the vectors have the same direction.

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?