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Medieval Islamic astronomy comprises the astronomical developments made in the Islamic world, particularly during the Islamic Golden Age (9th–13th centuries)...

A quark star is a hypothetical type of compact, exotic star, where extremely high core temperature and pressure have forced nuclear particles to form quark...

Phoebe (/ˈfiːbi/ FEE-bee) is the most massive irregular satellite of Saturn with a mean diameter of 213 km (132 mi). It was discovered by William Henry...

T Tauri stars (TTS) are a class of variable stars that are less than about ten million years old. This class is named after the prototype, T Tauri, a young...

Selenography is the study of the surface and physical features of the Moon (also known as geography of the Moon, or selenodesy). Like geography and areography...

Barnacle Bill is a 40-centimetre (16 in) rock on Mars in Ares Vallis. It was the first rock on Mars analyzed by the Sojourner rover using its Alpha Proton...

In astronomy, a rubble pile is a celestial body that consists of numerous pieces of debris that have coalesced under the influence of gravity. Rubble piles...

Sudarsky classification as used in Celestia. Sudarsky's classification of gas giants for the purpose of predicting their appearance based on their temperature...

Bryan Daniel O'Connor (born September 6, 1946) is a retired United States Marine Corps Colonel and former NASA astronaut. He was inducted into the United...

Sacajawea Patera is a large, elongate caldera located in Western Ishtar Terra on the smooth plateau of Lakshmi Planum, on the planet Venus. The image is...

Mare Marginis (Latin for 'Sea of the Edge'); /ˈmɑːrdʒɪnɪs/ MAR-jin-iss) is a lunar mare that lies on the very edge of the lunar nearside. The selenographic...

In physical cosmology, assuming that nature is described by a Grand Unified Theory, the grand unification epoch was the period in the evolution of the...

Palus Epidemiarum /ˈpeɪləs ɛpɪdiːmiˈɛərəm/ (Latin palūs epidēmiārum Marsh of Epidemics) is a small lunar mare in the southwestern part of the Moon's near...

The Institut d'Astrophysique de Paris (translated: Paris Institute of Astrophysics) is a research institute in Paris, France. The Institute is part of...

Listed below are the largest ocean, lakes and seas in the Solar System and beyond includes single bodies of water or other liquid on or near the surface...

Following are the largest impact craters on various worlds of the Solar System. For a full list of named craters, see List of craters in the Solar System...

The (n-p) reaction, or (n,p) reaction, is an example of a nuclear reaction. It is the reaction which occurs when a neutron enters a nucleus and a proton...

In orbital mechanics, a frozen orbit is an orbit for an artificial satellite in which perturbations have been minimized by careful selection of the orbital...

Gustav Andreas Tammann (24 July 1932 – 6 January 2019) was a German astronomer and academic. He served as director of the Astronomical Institute of the...

The End of the World (Danish: Verdens Undergang) is a 1916 Danish science fiction drama film directed by August Blom and written by Otto Rung, starring...