In astronomy & space, universe means: All of space and time and everything in it: matter, energy, planets, stars and galaxies. Its observable part is about 93 billion light-years across.
In Turkish: evren, kainat
How it is used
Usually 'the universe', in lower or upper case. Cosmologists talk about the early universe, the age and expansion of the universe and the observable universe. 'Cosmos' is a more literary synonym.
Example sentences
The universe is about 13.8 billion years old.
Ordinary matter makes up only about five percent of the universe.
Common collocations
the early universe
the observable universe
the expanding universe
the age of the universe
Related terms
Big BangThe scientific model in which the universe began about 13.8 billion years ago in an extremely hot, dense state and has been expanding and cooling ever since.
dark energyThe unknown cause of the accelerating expansion of the universe. It makes up about two thirds of the total energy content of the universe.
dark matterAn invisible form of matter that neither gives off nor absorbs light but whose gravity holds galaxies and galaxy clusters together. Its nature is still unknown.
galaxyAn enormous system of stars, gas, dust and dark matter held together by gravity. A large galaxy can contain hundreds of billions of stars.
cosmic microwave backgroundThe faint microwave radiation that fills the whole sky, left over from about 380,000 years after the Big Bang. It is often shortened to CMB.
