19 Facts About Outer space

Intergalactic Outer space takes up most of the volume of the universe, but even galaxies and star systems consist almost entirely of empty Outer space.

The flat Universe, combined with the measured mass density of the Universe and the accelerating expansion of the Universe, indicates that Outer space has a non-zero vacuum energy, which is called dark energy.

The deep vacuum of intergalactic Outer space is not devoid of matter, as it contains a few hydrogen atoms per cubic meter.

Temperature of outer space is measured in terms of the kinetic activity of the gas, as it is on Earth.

The radiation of outer space has a different temperature than the kinetic temperature of the gas, meaning that the gas and radiation are not in thermodynamic equilibrium.

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The treaty states that outer space is free for all nation states to explore and is not subject to claims of national sovereignty, calling outer space the "province of all mankind".

Since 1958, outer space has been the subject of multiple United Nations resolutions.

Interplanetary Outer space extends to the heliopause, whereupon the solar wind gives way to the winds of the interstellar medium.

Interstellar Outer space then continues to the edges of the galaxy, where it fades into the intergalactic void.

GeoOuter space is populated by electrically charged particles at very low densities, the motions of which are controlled by the Earth's magnetic field.

Deep Outer space is defined by the United States government and others as any region beyond cislunar Outer space.

Interplanetary Outer space is defined by the solar wind, a continuous stream of charged particles emanating from the Sun that creates a very tenuous atmosphere for billions of kilometers into Outer space.

Interplanetary Outer space extends out to the heliopause where the influence of the galactic environment starts to dominate over the magnetic field and particle flux from the Sun.

Volume of interplanetary Outer space is a nearly total vacuum, with a mean free path of about one astronomical unit at the orbital distance of the Earth.

Interstellar Outer space is the physical Outer space within a galaxy beyond the influence each star has upon the encompassed plasma.

Term outward Outer space was used in 1842 by the English poet Lady Emmeline Stuart-Wortley in her poem "The Maiden of Moscow".

The expression outer space was used as an astronomical term by Alexander von Humboldt in 1845.

The shorter term Outer space is older, first used to mean the region beyond Earth's sky in John Milton's Paradise Lost in 1667.

Deep vacuum of Outer space could make it an attractive environment for certain industrial processes, such as those requiring ultraclean surfaces.