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What if any thing is in between galaxies, besides space?
How much cooler are sunspots than the actual surface of the Sun?

"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 Kelvin; sunspots are about (?) 1000 degrees cooler. The Sun's photosphere (higher up in the Sun's atmo- sphere) can get to over 10 million degrees!


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