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  1. What is the Universe? - Science@NASA

    Oct 29, 2024 · The universe is everything. It includes all of space, and all the matter and energy that space contains. It even includes time itself and, of course, it includes you.

  2. Universe - Wikipedia

    It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of matter and energy, and the structures they form, from sub-atomic …

  3. What is the universe? - Live Science

    May 3, 2022 · The universe is literally everything, the sum of all existence. It includes all matter, like stars and galaxies. The universe also includes all radiation and all other forms of energy. …

  4. What is the Universe? Humanity’s Grandest Mystery

    Aug 31, 2025 · The universe is not just where we live—it is what we are. To understand the universe is to understand ourselves. To gaze into the night sky is to look into a mirror that …

  5. Universe | Definition & Facts | Britannica

    6 days ago · It is differentiated from the entirety of the universe, which is the whole cosmic system of matter and energy, including the human race. Unlike the observable universe, the universe …

  6. What is the Universe? | Types, Definition, Structure, Function & Facts

    Jul 26, 2025 · Scientists believe that the universe began 13-14 billion years ago with the beginning of a massive explosion called the Big Bang. Distant galaxies are constantly moving …

  7. What is the Universe? - AMNH

    The universe is all the matter, energy, and space that exist. We can observe only a part of it - the observable universe. The entire, universe, including the part we cannot see, may be infinite. …

  8. The Universe - Schools' Observatory

    It contains all the stars, planets, dust, gas, atoms, dark matter, light, and the space in between. It even includes the laws of physics, like gravity. Everything which exists is part of our Universe. …

  9. Universe Facts - Space Facts

    The universe is the sum total of all the planetary systems, stars, nebulae, galaxies, galactic clusters, black holes, and the atoms and molecules that make all these objects. It also …

  10. What is the universe? - Globe Language

    Nov 26, 2024 · The universe encompasses everything that exists: all of space, time, matter, energy, galaxies, stars, planets, and even the physical laws that govern them. Here’s an …