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The multiverse is the hypothetical set of all universes. [1][a] Together, these universes are presumed to comprise everything that exists: the entirety of space, time, matter, energy, information, and the physical laws and constants that describe them. The different universes within the multiverse are called "parallel universes", "flat ...
The observable universe contains as many as an estimated 2 trillion galaxies [101] [102] [103] and, overall, as many as an estimated 10 24 stars [104] [105] – more stars (and earth-like planets) than all the grains of beach sand on planet Earth; [106] [107] [108] but less than the total number of atoms estimated in the universe as 10 82; [109 ...
Ordinary (baryonic) matter (4.9%) Dark matter (26.8%) Dark energy (68.3%) [ 6 ] The observable universe is a ball-shaped region of the universe consisting of all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach ...
t. e. The chronology of the universe describes the history and future of the universe according to Big Bang cosmology. Research published in 2015 estimates the earliest stages of the universe's existence as taking place 13.8 billion years ago, with an uncertainty of around 21 million years at the 68% confidence level.
Detailed measurements of the expansion rate of the universe place the Big Bang singularity at an estimated 13.787 ± 0.020 billion years ago, which is considered the age of the universe. [12] There remain aspects of the observed universe that are not yet adequately explained by the Big Bang models.
NASA hopes 'artificial star' can teach us more about the universe. Look up into the sky on a clear night, and you're likely to glimpse thousands of stars dotting the cosmos. Add a telescope into ...
The National Aeronautics and Space Administration (NASA / ˈnæsə /) is an independent agency of the U.S. federal government responsible for the civil space program, aeronautics research, and space research.
Size (left) and distance (right) of a few well-known galaxies put to scale. The following is a list of notable galaxies.. There are about 51 galaxies in the Local Group (see list of nearest galaxies for a complete list), on the order of 100,000 in the Local Supercluster, and an estimated 100 billion in all of the observable universe.