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The proton storms in the solar wind travel at almost the speed of light.

Sunspots usually come in pairs of north and south magnetic poles.

Although sunspots are cooler areas in the photosphere, when they increase in number that tells us the Sun is becoming more active.

The solution to the solar neutrino problem was:

The Doppler shift is used to find

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?