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The galactic year, also known as a cosmic year, is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy. [ 1] 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 ...
A red dwarf is the smallest kind of star on the main sequence. Red dwarfs are by far the most common type of fusing star in the Milky Way, at least in the neighborhood of the Sun. However, due to their low luminosity, individual red dwarfs cannot be easily observed. From Earth, not one star that fits the stricter definitions of a red dwarf is ...
Gallifrey ( / ˈɡælɪfreɪ /; sometimes, in the classic series, / ˈɡælɪfriː / ), is a fictional planet in the long-running British science fiction television series Doctor Who. It is the original home world of the Time Lords, the civilisation to which the protagonist, the Doctor belongs. It is located in a binary star system [ 2] 250 ...
A graphical view of the Cosmic Calendar, featuring the months of the year, days of December, the final minute, and the final second. The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.
The Oort cloud ( / ɔːrt, ʊərt / ), [ 1] sometimes called the Öpik–Oort cloud, [ 2] is theorized to be a vast cloud of icy planetesimals surrounding the Sun at distances ranging from 2,000 to 200,000 AU (0.03 to 3.2 light-years ). [ 3][ note 1][ 4] The concept of such a cloud was proposed in 1950 by the Dutch astronomer Jan Oort, in whose ...
The plaque attached to Pioneer 10. The Pioneer plaques are a pair of gold - anodized aluminum plaques that were placed on board the 1972 Pioneer 10 and 1973 Pioneer 11 spacecraft, featuring a pictorial message, in case either Pioneer 10 or 11 is intercepted by intelligent extraterrestrial life. The plaques show the nude figures of a human male ...
General periods. Geologic Time – Period prior to humans. 4.6 billion to 3 million years ago. (See "prehistoric periods" for more detail into this.) Primatomorphid Era – Period prior to the existence of Primatomorpha. Simian Era – Period prior to the existence of Simiiformes. Hominoid Era – Period prior to the existence of Hominoidea.
In astronomy, a conjunction occurs when two astronomical objects or spacecraft appear to be close to each other in the sky. This means they have either the same right ascension or the same ecliptic longitude, usually as observed from Earth. [ 1][ 2] When two objects always appear close to the ecliptic —such as two planets, the Moon and a ...