What do we call unoccupied space in outer space?

Astronomers have discovered a curious empty section of space which is missing around 10,000 galaxies. The 'supervoid', which is 1.8 billion light-years across, is the largest known structure ever discovered in the universe but scientists are baffled about what it is and why it is so ... read more

However, the space between galaxies isn't typically a “void” as we think of it. That area contains many phenomena, such as Intergalactic Stars, Dust, various other types of Baryonic Matter, Dark Matter, Dark Energy, Radio Galaxies, and many more celestial objects. read more

Outer space, or just space, is the expanse that exists beyond the 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. read more