Space contains about 68% dark energy, 27% dark matter, and 5% observable
solid matter.

The vast majority of the universe is comprised of dark energy and dark
matter -- less than 5% of the stuff in space is solid, such as stars or
galaxies. The commonly accepted proportions of the contents in space are
about 68% dark energy, 27% dark matter, and 5% observable solid matter.
Dark energy refers to an unknown form of energy that is thought to be
responsible for expanding the universe and pulling solid matter apart over
long periods of time, while dark matter is matter that cannot be seen
because it doesn’t interact with light but is thought to exist due to the
fact that its gravitational properties can be measured.