RULE UPDATE: Please consult the following thread for an important update, effective immediately, to the site's "Tag What You See" rule: http://e621.net/forum/show/67138
Site Update: We've temporarily disabled the tag sidebar on the post index (when searching) since it seems to be the cause of the performance problem. It'll be back soon once we fix or rewrite it.
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Outer space is the void that exists beyond any celestial body, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles: predominantly a plasma of hydrogen and helium, as well as electromagnetic radiation, magnetic fields, and neutrinos. Theoretically, it also contains dark matter and dark energy.
