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 …

Dec 3, 2025 · Discover the universe: Learn about the history of the cosmos, what it's made of, and so much more. Concentrations of matter with gravity so powerful not even light can …

Dec 27, 2025 · Universe, the whole cosmic system of matter and energy of which Earth is a part.

These are some of the questions addressed by cosmology, the study of the universe as a whole. Smithsonian astronomers and astrophysicists use observational and theoretical techniques to …

Aug 31, 2025 · It tells us that the universe began nearly 13.8 billion years ago in a cataclysmic event known as the Big Bang. From a state of unimaginable density and heat, space itself …

1 day ago · An academic dives into his research on exploring the shape of the universe and what it means for our early beginnings.

Astronomy.com is for anyone who wants to learn more about astronomy events, cosmology, planets, galaxies, asteroids, astrophotography, the Big Bang, black holes ...

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. …

The universe is filled with an amazing variety of celestial objects. Find out about astronomy through history, how we understand the sky, constellations, sky maps and stars, exoplanets, …

Oct 22, 2024 · 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 …