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The expansion of the universe is the increase in distance between gravitationally unbound parts of the observable universe with time. [1] It is an intrinsic expansion, so it does not mean that the universe expands "into" anything or that space exists "outside" it. To any observer in the universe, it appears that all but the nearest galaxies ...
The accelerated expansion of the universe is thought to have begun since the universe entered its dark-energy-dominated era roughly 5 billion years ago. [8] [notes 1] Within the framework of general relativity , an accelerated expansion can be accounted for by a positive value of the cosmological constant Λ , equivalent to the presence of a ...
Physical cosmology. The Big Crunch is a hypothetical scenario for the ultimate fate of the universe, in which the expansion of the universe eventually reverses and the universe recollapses, ultimately causing the cosmic scale factor to reach zero, an event potentially followed by a reformation of the universe starting with another Big Bang.
The universe is expanding faster than previously believed, ... which is about 186,000 miles (300,000 km) per second. ... much like a 100-watt light bulb appears dimmer the farther away it is.
The universe's size is unknown, and it may be infinite in extent. 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 travel ...
Something is changing the expansion rate of the universe, scientists have said. For decades, researchers have been attempting to measure the “Hubble constant”, or the speed at which the cosmos ...
The Wandering Earth. The Wandering Earth ( Chinese: 流浪地球; pinyin: liúlàng dìqiú) is a 2019 Chinese science fiction film directed by Frant Gwo, loosely based on the 2000 short story of the same name by Liu Cixin. The film stars Wu Jing, Qu Chuxiao, Li Guangjie, Ng Man-tat, Zhao Jinmai and Qu Jingjing.
In an expanding universe, the speed of expansion reaches — and even exceeds — the speed of light, preventing signals from traveling to some regions. A cosmic event horizon is a real event horizon because it affects all kinds of signals, including gravitational waves, which travel at the speed of light.