![]() ![]() Local concentrations of matter have condensed into stars and galaxies. ![]() The plasma between galaxies is thought to account for about half of the baryonic (ordinary) matter in the universe, having a number density of less than one hydrogen atom per cubic metre and a kinetic temperature of millions of kelvins. The baseline temperature of outer space, as set by the background radiation from the Big Bang, is 2.7 kelvins (−270 ☌ −455 ☏). Outer space is not completely empty it is a near-perfect vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium as well as electromagnetic radiation, magnetic fields, neutrinos, dust, and cosmic rays. Outer space, commonly referred to simply as space, is the expanse that exists beyond Earth and its atmosphere and between celestial bodies. The layers of the atmosphere are drawn to scale, whereas objects within them, such as the International Space Station, are not. The Kármán line at an altitude of 100 km (62 mi) is shown.
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