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As we go outward from Io to Ganymede, the density of the moons _________ .

A star system where we observe the magnitude to increase and decrease is an _________ .

In the proton-proton cycle, the helium atom and neutrino have less mass than the original hydrogen.  What happens to the “lost” mass?

The mass of the newly formed star will determine its position on the main sequence.

Given that a large sunspot, about 100X smaller than the Sun, is about the same size as our planet, how many Earths could fit inside the Sun’s vast volume?

The absolute magnitude of a star is how bright it appears if viewed from a distance of _______ light-years.

The largest moon in the solar system, bigger but not as massive as Mercury, is:

The star’s __________ plays the major role in determining its main sequence position and luminosity.

Most naked-eye stars would fall to the bottom right on the H-R diagram.

The Maunder Minimum refers to a period of sustained solar__________ from 1645 until about 1715.