Outer space, or simply space, is the expanse that exists beyond Earth and between celestial bodies. Outer space is not completely empty—it is a hard 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. The baseline temperature of outer space, as set by the background radiation from the Big Bang, is 2.7 kelvins (−270.45 °C; −454.81 °F).[1] The plasma between galaxies accounts for about [...]

Space Exploration

Space exploration From Wikipedia, the free encyclopediaJump to navigationJump to search"Space Exploration" redirects here. For the company, see SpaceX.Humans explore the lunar surfaceThis Kuiper belt object, known as Ultima Thule, is the farthest closely visited Solar System body, seen in 2019 Space exploration is the use of astronomy and space technology to explore outer space.[1] While the exploration of space is carried out mainly [...]