Draft:Outline of outer space

The following outline is provided as an overview of and topical guide to outer space:

Outer space (or simply space) is the expanse beyond celestial bodies and their atmospheres. It contains ultra-low levels of particle densities, constituting a near-perfect vacuum of predominantly hydrogen and helium plasma, permeated by electromagnetic radiation, cosmic rays, neutrinos, magnetic fields and dust. The baseline temperature of outer space, as set by the background radiation from the Big Bang, is 2.7 kelvins (−270 °C; −455 °F).

What type of thing is outer space?

Outer space can be described as all of the following:

History of outer space

• Horror vacui (physics)
• Aether (classical element)
• Luminiferous aether
• Big Bang