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It's not that the universe was a dark, empty space and an explosion happened in it from which all matter sprang forth. The universe didn’t exist. Space didn’t exist. Time is part of the universe and so it didn’t exist. Time, too, began with the big bang.
- Overview - NASA Science
The Universe’s History The origin, evolution, and nature of...
- Universe - NASA Science
Discover the universe: Learn about the history of the...
- Overview - NASA Science
Due to the finite speed of light, we see more distant parts of the universe at earlier times. Due to the finite speed of light, there is a limit (known as the particle horizon) to how far light can travel over the age of the universe. The spatial region from which we can receive light is called the observable universe.
The Universe’s History The origin, evolution, and nature of the universe have fascinated and confounded humankind for centuries. New ideas and major discoveries made during the 20th century transformed cosmology – the term for the way we conceptualize and study the universe – although much remains unknown. Here is the history of the universe according […]
The universe's size is unknown, and it may be infinite in extent. [14] Some parts of the universe are too far away for the light emitted since the Big Bang to have had enough time to reach Earth or space-based instruments, and therefore lie outside the observable universe. In the future, light from distant galaxies will have had more time to ...
- Exoplanets. Worlds beyond our solar system.
- Stars. Giant balls of hot gas that burn for millions to billions of years.
- Black Holes. Concentrations of matter with gravity so powerful not even light can escape.
- Galaxies. Collections of stars, planets, and vast clouds of gas and dust bound together by gravity.
3 days ago · universe, the whole cosmic system of matter and energy of which Earth, and therefore the human race, is a part. Humanity has traveled a long road since societies imagined Earth, the Sun , and the Moon as the main objects of creation, with the rest of the universe being formed almost as an afterthought.
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When the mass we calculate from the bend and the mass we can observe directly don’t agree, we know dark matter must be present. Modern calculations say dark matter comprises about 27% of the Universe. We don’t yet know what it is, but we are searching for answers. We have known that the Universe is expanding since the early 20th century.
