The universe is defined as everything - all space, all time, all matter and energy.
The universe is all of reality which consists of concrete and abstract objects.
The universe consists of matter.
The universe is the whole natural world. It consists of four-dimensional space-time containing all matter and energy.
The universe consists of all space and the matter that space contains, including galaxies, stars, planets, and other celestial bodies. It also includes dark matter and dark energy, which are thought to make up a significant portion of the universe.
The universe is the whole creation viewed as the work of a supreme God in monotheism or the gods in polytheism. The universe consists of both physical and spiritual creatures and is also the domain in which God or the gods exercise supernatural authority.
Hydrogen is the lightest (it is a gas) and most abundant element in the Universe. A hydrogen atom consists of a single proton and a single electron, making it the simplest atom in the Universe.
Since the universe consists of everything, the most likely answer is no. No other universe is detectable by us, but there are a few therories that allow the mathematical existence of "paralel" universes, but since we can't interreact with them they may as well not exist for all the difference it will make.
Everything that is not energy consists of matter, which includes all physical substances in the universe such as atoms, molecules, and particles.
It seems the Universe consists almost entirely out of matter - that is, there are no significant amounts of antimatter. Why there is more matter than antimatter is an unsolved problem.
Nature consists of all physical entities whether animate or inanimate that are formed spontaneously in the universe and are not manufactured by humans.
About 5% of our Universe consists of baryonic matter; ie, stuff we fully understand. Our Universe also contains about four times more mass in some form we DON'T understand, and that's why we call it "dark matter." And about 75% of the energy of the Universe consists of something that is causing the rate of expansion of our Universe to speed up. It can't be something with mass, because mass would cause the rate of expansion to slow down. So it has be some form of energy we just don't understand -- so, for now, we simply call it "dark energy." These two entities have nothing whatsoever in common other than the first word in the description we humans have given to them.
Quite simply, the universe consists of everything we know. There are no proven thories of so-called "extrauniversal" matter at this time so everything we know as fact, is contained within the universe and is apart of the universe itself. Theoretically, knowing of anything extrauniversal would require that the observer also exist outside of the universe, just like how it is impossible for humans to properly perceive anything that exists in 4 spacial dimensions and just like how humans only see in 2 dimensions (If humans perceived in 3 dimensions, you would see the back of everything as well as the front at the same time). So as far as factual evidence goes, the universe consists of everything.