What element occupies outer space?

Answer 1

There is every known element floating around in outer space, since that is where most of the elements on Earth originally came from.

When a star that is 25 times the size of our own sun goes supernova, it explodes and sends out most of it's mass (24 solar masses) into outer space.

Answer 2

Outer space does not have a specific element that occupies it exclusively. Space is mostly a vacuum, containing very low density of atoms and particles. The most abundant elements in the universe are hydrogen and helium.

Answer 3

All of them, all elements can be found in outer space.

The most common element is Hydrogen.