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NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne Between galaxies; sunspots 
Name: Bryan Matthewkarp
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Question:
What if any thing is in between galaxies, besides space?
How much cooler are sunspots than the actual surface of the Sun?


Replies:
"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!

Hawley

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