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1 day ago · The universe is all of space and time [a] and their contents. [10] It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of energy and matter, and the structures they form, from sub-atomic particles to entire galactic filaments.
5 days ago · Learn about the universe, the whole cosmic system of matter and energy, from its origin in the big bang to its current state of expansion and evolution. Explore the observable universe, the solar system, the galaxies, and the possible multiverse with Britannica.
1 day ago · Find out what's happening in the cosmos with daily updates on space exploration, discoveries and events. Read about the latest missions, launches, discoveries and mysteries of the universe.
1 day ago · Astronomy. Photons are odd little beasts. They can act like waves. They can act like particles. They are teeny tiny messengers of force. They are carriers of energy. But most of all, they’re ...
3 days ago · The Universe. Exoplanets; The Search for Life in the Universe; Stars; Galaxies; Black Holes; The Big Bang; Dark Energy & Dark Matter
3 days ago · Until the dawn of spaceflight, astronomers were limited in their ability to observe objects beyond the solar system to those portions of the electromagnetic spectrum that can penetrate Earth’s atmosphere. These portions include the visible region, parts of the ultraviolet region, and most of the radio-frequency region.
1 day ago · The observable universe contains an estimated 10 22 to 10 24 stars. Only about 4,000 of these stars are visible to the naked eye—all within the Milky Way galaxy. A star's life begins with the gravitational collapse of a gaseous nebula of material largely comprising hydrogen, helium, and trace heavier elements.
