Everything we can see is only about 5% of the universe
Stars, planets, and people add up to a rounding error next to the dark matter and dark energy that dominate the cosmos.
Add up every star, planet, gas cloud, and living thing, and you have accounted for only about 5% of what the universe is made of. The rest is invisible and, frankly, mysterious.
Roughly 27% is dark matter, a substance that neither emits nor absorbs light but betrays its presence through gravity, tugging on galaxies and bending the paths of stars. The remaining 68% or so is dark energy, an even stranger ingredient that appears to be driving the universe’s expansion to speed up.
These proportions are not guesses; they come from precise measurements of the cosmic microwave background and the large-scale structure of galaxies, with Europe’s Planck mission pinning ordinary matter at about 4.9%, dark matter at 26.8%, and dark energy at 68.3%.
The familiar matter of textbooks and chemistry sets is a thin garnish on a cosmos overwhelmingly composed of things we have never directly detected.
Sources & references
2 referencesWell-established. Corroborated by 2 independent sources.
