What effect do solar flares have on Earth?

What is the source of the Sun's energy?

Star A is farther from Earth than Star B. Both stars have the same absolute magnitude.

About 90% of stars on the H-R Diagram are

Main sequence stars that are the brightest are

Astronomers observations of red shifts in spectral lines of distant galaxies indicates

You weigh 240 pounds on Earth. The moon's gravitational attraction is 1/6 that of Earth.

Stars with the highest surface temperature would be

The difference in the brightness of two stars with the same surface temperature is

The Hertzsprung-Russell Diagram shows the relationship between

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