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This article documents the most distant astronomical objects discovered and verified so far, and the time periods in which they were so classified. For comparisons with the light travel distance of the astronomical objects listed below, the age of the universe since the Big Bang is currently estimated as 13.787±0.020 Gyr. [1]
Picture Galaxy Type Distance from Earth Magnitude Group Membership Notes Diameter (ly) Millions of light-years Mpc M m - Milky Way: SBbc 0.0265 (to the galactic center) [2] 0.008 [2] ...
This is a list of the largest cosmic structures so far discovered. The unit of measurement used is the light-year (distance traveled by light in one Julian year; approximately 9.46 trillion kilometres). This list includes superclusters, galaxy filaments and large quasar groups (LQGs). The structures are listed based on their longest dimension.
The universe can be viewed as having a hierarchical structure. [2] At the largest scales, the fundamental component of assembly is the galaxy . Galaxies are organized into groups and clusters , often within larger superclusters , that are strung along great filaments between nearly empty voids , forming a web that spans the observable universe.
Therefore, the current cumulative mass of the Oort cloud is far less than was once suspected. [35] The estimated mass of the cloud is only a small part of the 50–100 Earth masses of ejected material. [4] Gravitational interaction with nearby stars and galactic tides modified cometary orbits to make them more circular.
The universe's size is unknown, and it may be infinite in extent. [14] 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 ...
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An infinite universe (unbounded metric space) means that there are points arbitrarily far apart: for any distance d, there are points that are of a distance at least d apart. A finite universe is a bounded metric space, where there is some distance d such that all points are within distance d of each other.