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What if any thing is in between galaxies, besides space? How much cooler are sunspotsthan the actual surface of the sun? Why is the sky sometimes green? How are satellites named?

"empty" space between galaxies (extra-galactic space) actually contains about one hydrogen atom per cubic meter. Inter-galactic space contains about one hydrogen atom per cubic cm.

The surface temperature of the sun is 5770 deg. Kelvin; sunspots are about (?) 1000 degrees cooler. the sun's photosphere (higher up in the sun's atmosphere) can get to over 10 million degrees!


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