- the physical universe beyond the earth’s atmosphere.
- Humans began the physical exploration of space during the 20th century with the advent of high-altitude balloon flights.
- Earth orbit was first achieved by Yuri Gagarin of the Soviet Union in 1961, and unmanned spacecraft have since reached all of the known planets in the Solar System.
Geospace – the region of outer space near Earth, including the upper atmosphere and magnetosphere
Cislunar space – The region outside Earth’s atmosphere and extending out to just beyond the Moon’s orbit
Interplanetary space – Interplanetary space contains the magnetic field generated by the Sun.
Interstellar space – Interstellar space is the physical space within a galaxy beyond the influence each star has upon the encompassed plasma
Intergalactic space – Intergalactic space is the physical space between galaxies.