Big Bang theory, in science, is the idea that all the matter and energy of the Universe was ... may have looked very different. Atoms literally did not exist yet. First gravity decoupled, then ...

Just how long has the universe been around? Scientists estimate the universe is 13.8 billion years old, with an uncertainty ...

The origins of life in the universe have been a topic of scientific ... through a series of chemical reactions. This theory ...

Red shift data provides evidence that the Universe, including space itself, is expanding. The discovery of the CMBR, after it had been predicted by the theory, provided very strong support for the ...

Note: For a definition of unfamiliar terms, see our glossary. The fundamental particles of the universe that physicists have identified—electrons, neutrinos, quarks, and so on—are the "letters ...

What is the universe expanding into if it’s already infinite? The universe expands by itself, not into any external space, ...

The rate at which the universe is expanding is expressed as a value called the Hubble Constant, generally abbreviated as “H 0 ...

The Hubble Space Telescope was the source of the Hubble tension saga; its observations have been a crucial part of the challenge. Astronomers have been using its successor, the James Webb Space ...

A new paper suggests the anthropic principle—that the universe is fine-tuned for life—can be tested. It would be falsified if ...