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That depends a bit what you mean by "everything". If you refer to the mass in the Universe:* About 68% of the mass in the Universe is in the form of dark energy. Nobody really knows what it is.

* About 27% of the mass in the Universe is in the form of dark matter. Nobody has a very clear idea what that is, either.

* About 5% of the mass is things we know; mainly, things made up of atoms, such as stars, planets, etc.

Of course, the Universe also contains things like space-time, fields, and particles.

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8y ago

What else can I help you with?