inner space

noun

1. the environment beneath the surface of the sea
2. the human mind regarded as being as unknown or as unfathomable as space

Example Sentences

As a result, physicists were left with no theory of “quantum gravity” to explain what happened when the realms of inner space and outer space collided, as in the Big Bang or inside black holes.

From New York Times

Gravity rules outer space, shaping galaxies and indeed the whole universe, whereas quantum mechanics rules inner space, the arena of atoms and elementary particles.

From New York Times

Transporting listeners to outer space and inner space.

From New York Times

The best was “Outer and Inner Space,” which, Wohl observes, “is a very great work of art, and it kills me that Edie had no idea what it meant to be its subject.”

From Washington Post

The film Wohl mentions is “Outer and Inner Space,” starring Edie and shot by Andy in 1965.

From Los Angeles Times