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 that exists beyond Earth's atmosphere and between celestial bodies. 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:

Regions of outer space

• Interplanetary space

Fields that study outer space

• Astronomy
  • Archaeoastronomy
  • Astrobiology
  • Astrometry
  • Astrogeology
  • Astrophysics
  • Cosmology
  • Exoplanetology
  • Gamma-ray astronomy
  • Gravitational-wave astronomy
  • Heliophysics
  • Infrared astronomy
  • Neutrino astronomy
  • Planetary science
  • Radio astronomy
  • Space archaeology
  • Space medicine
  • Space physics
  • Ultraviolet astronomy
  • X-ray astronomy

History of outer space

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