what percent of the universe is observable

The commonly cited answer is that about 5% of the universe is observable matter; the rest is mostly dark matter and dark energy.

Quick Scoop

If you mean the part we can actually see and measure, the observable universe is the visible slice of the cosmos bounded by the speed of light and the age of the universe.

If you mean the composition of the universe, then roughly 5% is ordinary matter , with about 27% dark matter and 68% dark energy.

Plain-language version

• Observable universe: the region of space we can detect from Earth.
• Visible/ordinary matter: stars, planets, gas, dust, and us.
• Hidden majority: dark matter and dark energy make up most of what cosmologists think exists.

Important nuance

People sometimes say “5% of the universe is observable,” but that phrase is a little imprecise. The more accurate statement is that about 5% of the universe’s content is ordinary, visible matter ; the observable universe itself is just the part of the universe we can in principle see.

Simple example

Think of it like an iceberg: the part above water is the familiar, visible matter, while the much larger unseen part represents dark matter and dark energy.