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A light-year, alternatively ... (93 million miles). ... The comoving distance from the Earth to the edge of the visible universe is about 45.7 billion light-years in ...
One galactic year is approximately 225 million Earth years. [2] The Solar System is traveling at an average speed of 230 km/s (828,000 km/h) or 143 mi/s (514,000 mph) within its trajectory around the Galactic Center, [ 3 ] a speed at which an object could circumnavigate the Earth's equator in 2 minutes and 54 seconds; that speed corresponds to ...
In physical cosmology, the age of the universe is the time elapsed since the Big Bang.Astronomers have derived two different measurements of the age of the universe: [1] a measurement based on direct observations of an early state of the universe, which indicate an age of 13.787 ± 0.020 billion years as interpreted with the Lambda-CDM concordance model as of 2021; [2] and a measurement based ...
A light-year is the distance light travels in a year, 5.9 trillion miles (9.5 trillion km). ... The Big Bang event 13-14 billion years ago initiated the universe, and it has been expanding ever ...
Since the universe has been expanding for 13.8 billion years, the comoving distance (radius) is now about 46.6 billion light-years. Thus, volume ( 4 / 3 πr 3 ) equals 3.58 × 10 80 m 3 and the mass of ordinary matter equals density ( 4.08 × 10 −28 kg/m 3 ) times volume ( 3.58 × 10 80 m 3 ) or 1.46 × 10 53 kg .
The universe has appeared much the same as it does now, for many billions of years. It will continue to look similar for many more billions of years into the future. The Galactic disk of the Milky Way is estimated to have been formed 8.8 ± 1.7 billion years ago but only the age of the Sun, 4.567 billion years, is known precisely. [82]
This is a list of known galaxies within 3.8 megaparsecs (12.4 million light-years) of the Solar System, in ascending order of heliocentric distance, or the distance to the Sun. This encompasses about 50 major Local Group galaxies, and some that are members of neighboring galaxy groups , the M81 Group and the Centaurus A/M83 Group , and some ...
With the release of Gaia's observations of the star, it has since been refined to a much closer 0.178 light-years (0.055 pc), close enough to significantly disturb objects in the Oort cloud, which extends 1.2 light-years (0.37 pc) from the Sun. [74] Gaia 's third data release has provided updated values for many of the candidates in the table ...