Which surface feature of the Moon is NOT found on Mercury?

A. craters
B. rays
C. maria
D. mountains


Answer: C

Physics & Space Science

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The pink color of the chromosphere arises from the emission of light from

A) hydrogen atoms. B) helium atoms. C) carbon atoms. D) beryllium atoms.

Physics & Space Science

This figure is a diagram of a multiflash image of an air puck moving to the right on a horizontal surface. The images sketched are separated by equal time intervals, and the first and last images show the puck at rest. In figure c, which color graph best shows the puck’s velocity as a function of time?

Physics & Space Science

An astronomer named _______________ used globular clusters to locate the center of the galaxy. (enter last name only)

Fill in the blank(s) with correct word

Physics & Space Science

What is a superbubble?

A) a very low-density region of interstellar space, formed by the merger of several bubbles B) a very high-density region of interstellar space, filled with gas ejected from nearby star systems C) a bubble so large that it fills much of the galactic halo D) the region of space cleared by a powerful supernova E) a cloud of gas that can form a million or more stars

Physics & Space Science