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.
what do scientist assume about the universe???
The answer to life, the universe and everything is 42.
The universe is everything that exists. It contains everything.
the universe can not be everything because there has to be space for it to expand into
Do you have a specific scientist in mind??
Issac Newton
Everything in space is part of the universe or cosmos.the universe
no scientific equipment can go out of this universe because the scientist won't get feedback and astronaut can't go out of the universe because the astronauts well get stuck.
Cosmologist
cosmologists
Everything is.
The answer to life, the universe, and everything is 42.