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Hydrogen lines are weak in M class stars because they have much less of it than do A class stars.

Nuclear _____________ explains the Sun’s immense and sustained energy output.

The surface of Europa is most like the Earth’s __________ .

The Sun, at absolute magnitude +4.8, would be one of the brightest stars in the sky if seen from 32 light years distance.

Where on the H-R diagram are the majority of stars that dominate the night?

Suppose a large flare is detected optically.  How long until radio interference arrives?

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.