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Brown dwarfs are substellar objects that have more mass than the biggest gas giant planets, but less than the least massive main-sequence stars. Their...

Asteroid mining is the hypothetical extraction of materials from asteroids and other minor planets, including near-Earth objects. Notable asteroid mining...

The lunar maria (/ˈmæri.ə/ MARR-ee-ə; sg. mare /ˈmɑːreɪ, -i/ MAR-ay, MAR-ee) are large, dark, basaltic plains on Earth's Moon, formed by lava flowing into...

SN 1054 is a supernova that was first observed on c. 10 July [O.S. c. 4 July] 1054, and remained visible until c. 12 April [O.S. c. 6 April] 1056.α The...

The Crab Pulsar (PSR B0531+21 or Baade's Star) is a relatively young neutron star. The star is the central star in the Crab Nebula, a remnant of the supernova...

The Uppsala Schmidt Telescope is a Schmidt telescope located in Australia. It was moved to Siding Spring Observatory from Mount Stromlo Observatory in...

Solar conjunction generally occurs when a planet or other Solar System object is on the opposite side of the Sun from the Earth. From an Earth reference...

George Bishop's Observatory (code: 969) was an astronomical observatory erected in 1836 by the astronomer George Bishop near his residence at the South...

George Henry Peters (1863–October 18, 1947) was a US astronomer and a discoverer of minor planets. He worked at the U.S. Naval Observatory as an astrophotographer...

In thermodynamics, a mechanically isolated system is a system that is mechanically constraint to disallow deformations, so that it cannot perform any work...