Space

243 Ida is an asteroid in the Koronis family of the asteroid belt. It was discovered on 29 September 1884 by Austrian astronomer Johann Palisa at Vienna Observa…

General relativity, also known as the general theory of relativity, and as Einstein's theory of gravity, is the geometric theory of gravitation published by Alb…

Kes is a fictional character played by Jennifer Lien on the American science-fiction television show Star Trek: Voyager. The series follows the crew of the star…

In astronomy, the main sequence is a classification of stars which appear on plots of stellar color versus brightness as a continuous and distinctive band. Star…

The Oort cloud (pronounced /ɔːrt/ ORT or /ʊərt/ OORT), sometimes called the Öpik–Oort cloud, is theorized to be a cloud of billions of icy planetesimals surroun…

Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in …

Sennacherib (Neo-Assyrian Akkadian: 𒀭𒌍𒉽𒈨𒌍𒋢, romanized: Sîn-aḥḥī-erība or Sîn-aḥḥē-erība, meaning "Sîn has replaced the brothers") was the king of the Neo-Assyri…

Tau Ceti is a single star in the constellation Cetus. Its name is a Bayer designation that is Latinized from τ Ceti, and abbreviated Tau Cet or τ Cet. Spectrall…