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Phoebe (moon)
Phoebe ( ) is the most massive irregular satellite, irregular Moons of Saturn, satellite of Saturn with a mean diameter of . It was discovered by William Henry Pickering on 18 March 1899 from photographic plates that had been taken by DeLisle Stewart starting on 16 August 1898 at the Boyden Observatory, Boyden Station of the Carmen Alto Observatory near Arequipa, Peru. It was the first natural satellite to be discovered photographically. Phoebe was the first target encountered upon the arrival of the ''Cassini–Huygens, Cassini'' spacecraft in the Saturn system in 2004, and is thus unusually well-studied for an irregular moon of its size. ''Cassinis trajectory to Saturn and time of arrival were chosen to permit this flyby. After the encounter and its insertion into orbit, ''Cassini'' did not go much beyond the orbit of Iapetus (moon), Iapetus. Phoebe is roughly spherical and has a differentiated interior. It was spherical and hot early in its history and was battered out of rou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centaur (minor Planet)
In planetary astronomy, a centaur is a small Solar System body that orbits the Sun between Jupiter and Neptune and crosses the orbits of one or more of the giant planets. Centaurs generally have unstable orbits because of this; almost all their orbits have dynamic lifetimes of only a few million years, but there is one known centaur, 514107 Kaʻepaokaʻawela, which may be in a stable (though retrograde) orbit. Centaurs typically exhibit the characteristics of both asteroids and comets. They are named after the mythological centaurs that were a mixture of horse and human. Observational bias toward large objects makes determination of the total centaur population difficult. Estimates for the number of centaurs in the Solar System more than 1 km in diameter range from as low as 44,000 to more than 10,000,000. The first centaur to be discovered, under the definition of the Jet Propulsion Laboratory and the one used here, was 944 Hidalgo in 1920. However, they were not ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2005 In Science
The year 2005 in science and technology involved some significant events. Astronomy * January 5 – Eris, the most massive known dwarf planet in the Solar System, is identified by a team the Palomar Observatory in California from images taken on October 21, 2003 (discovery announced July 29, 2005). * February 23 – Astronomers announce the discovery of a galaxy, VIRGOHI21, that consists almost entirely of dark matter. * March 23 – Two independent teams report the observation of light from planets circling two different stars, using the Spitzer infrared space telescope. Both groups detect a during conjunction, when the planet is moving behind its sun's disk (occultation). * March 31 – Dwarf planet Makemake is discovered in the Kuiper belt (discovery announced July 29). * April 8 – Total solar eclipse. * May 18 – A second photograph by the Hubble Space Telescope confirms the discovery of two new moons of Pluto: Nix and Hydra. * July 20–27 – Controversy over th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jason
Jason ( ; ) was an ancient Greek mythological hero and leader of the Argonauts, whose quest for the Golden Fleece is featured in Greek literature. He was the son of Aeson, the rightful king of Iolcos. He was married to the sorceress Medea, the granddaughter of the sungod Helios. Jason appeared in various literary works in the classical world of Greece and Rome, including the epic poem ''Argonautica'' and the tragedy '' Medea''. In the modern world, Jason has emerged as a character in various adaptations of his myths, such as the 1963 film '' Jason and the Argonauts'' and the 2000 TV miniseries of the same name. Persecution by Pelias Pelias (Aeson's half-brother) was power-hungry and sought to gain dominion over all of Thessaly. Pelias was the progeny of a union between their shared mother, Tyro ("high born Tyro"), the daughter of Salmoneus, and the sea god Poseidon. In a bitter feud, he overthrew Aeson (the rightful king), killing all the descendants of Aeson ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planetary Nomenclature
Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed. Since the invention of the telescope, astronomers have given names to the surface features they have discerned, especially on the Moon and Mars. To found an authority on planetary nomenclature, the International Astronomical Union (IAU) was organized in 1919 to designate and standardize names for features on Solar System bodies. IAU approval procedure When images are first obtained of the surface of a planet or satellite, a theme for naming features is chosen and a few important features are named, usually by members of the appropriate IAU task group (a commonly accepted planet-naming group). Later, as higher resolution images and maps become available, additional features are named at the request of investigators mapping or describing specific surfaces, fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Astronomical Union
The International Astronomical Union (IAU; , UAI) is an international non-governmental organization (INGO) with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach, education, and development through global cooperation. It was founded on 28 July 1919 in Brussels, Belgium and is based in Paris, France. The IAU is composed of individual members, who include both professional astronomers and junior scientists, and national members, such as professional associations, national societies, or academic institutions. Individual members are organised into divisions, committees, and working groups centered on particular subdisciplines, subjects, or initiatives. the Union had 85 national members and 12,734 individual members, spanning 90 countries and territories. Among the key activities of the IAU is serving as a forum for scientific conferences. It sponsors nine annual symposia and holds a triannual General Assembly that sets policy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saturn (mythology)
Saturn ( ) was a god in Religion in ancient Rome, ancient Roman religion, and a character in Roman mythology. He was described as a god of time, generation, dissolution, abundance, wealth, agriculture, periodic renewal and liberation. Saturn's mythological reign was depicted as a Golden Age of abundance and peace. After the Roman conquest of Greece, he was conflated with the Greek Titan Cronus. Saturn's consort was his sister Ops, with whom he fathered Jupiter (mythology), Jupiter, Neptune (mythology), Neptune, Pluto (mythology), Pluto, Juno (mythology), Juno, Ceres (Roman mythology), Ceres and Vesta (mythology), Vesta. Saturn was especially celebrated during the festival of Saturnalia each December, perhaps the most famous of the Roman festivals, a time of feasting, role reversals, free speech, gift-giving and revelry. The Temple of Saturn in the Forum Romanum, Roman Forum housed the state treasury and archives (''aerarium'') of the Roman Republic and the early Roman Empire. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roman Mythology
Roman mythology is the body of myths of ancient Rome as represented in the literature and visual arts of the Romans, and is a form of Roman folklore. "Roman mythology" may also refer to the modern study of these representations, and to the subject matter as represented in the literature and art of other cultures in any period. Roman mythology draws from the mythology of the Italic peoples and shares mythemes with Proto-Indo-European mythology. The Romans usually treated their traditional narratives as historical, even when these have miraculous or supernatural elements. The stories are often concerned with politics and morality, and how an individual's personal integrity relates to his or her responsibility to the community or Roman state. Heroism is an important theme. When the stories illuminate Roman religious practices, they are more concerned with ritual, augury, and institutions than with theology or cosmogony. Roman mythology also draws on Greek mythology, pri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cronus
In ancient Greek religion and Greek mythology, mythology, Cronus, Cronos, or Kronos ( or ; ) was the leader and youngest of the Titans, the children of Gaia (Earth) and Uranus (mythology), Uranus (Sky). He overthrew his father and ruled during the mythological Golden Age until he was overthrown by his son Zeus and imprisoned in Tartarus. According to Plato, however, the deities Phorcys, Cronus, and Rhea (mythology), Rhea were the eldest children of Oceanus and Tethys (mythology), Tethys. Cronus was usually depicted with a harpe, scythe, or sickle, which was the instrument he used to castrate and depose Uranus, his father. In Athens, on the twelfth day of the Attic month of Attic calendar, Hekatombaion, a festival called Kronia was held in honour of Cronus to celebrate the harvest, suggesting that, as a result of his association with the virtuous Golden Age, Cronus continued to preside as a List of agricultural gods, patron of the harvest. Cronus was also identified in classi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moon
The Moon is Earth's only natural satellite. It Orbit of the Moon, orbits around Earth at Lunar distance, an average distance of (; about 30 times Earth diameter, Earth's diameter). The Moon rotation, rotates, with a rotation period (lunar day) that is synchronized to its orbital period (Lunar month#Synodic month, lunar month) of 29.5 Earth days. This is the product of Earth's gravitation having tidal forces, tidally pulled on the Moon until one part of it stopped rotating away from the near side of the Moon, near side, making always the same lunar surface face Earth. Conversley, the gravitational pull of the Moon, on Earth, is the main driver of Earth's tides. In geophysical definition of planet, geophysical terms, the Moon is a planetary-mass object or satellite planet. Its mass is 1.2% that of the Earth, and its diameter is , roughly one-quarter of Earth's (about as wide as the contiguous United States). Within the Solar System, it is the List of Solar System objects by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greek Mythology
Greek mythology is the body of myths originally told by the Ancient Greece, ancient Greeks, and a genre of ancient Greek folklore, today absorbed alongside Roman mythology into the broader designation of classical mythology. These stories concern the ancient Greek religion's view of the Cosmogony, origin and Cosmology#Metaphysical cosmology, nature of the world; the lives and activities of List of Greek deities, deities, Greek hero cult, heroes, and List of Greek mythological creatures, mythological creatures; and the origins and significance of the ancient Greeks' cult (religious practice), cult and ritual practices. Modern scholars study the myths to shed light on the religious and political institutions of ancient Greece, and to better understand the nature of mythmaking itself. The Greek myths were initially propagated in an oral tradition, oral-poetic tradition most likely by Minoan civilization, Minoan and Mycenaean Greece, Mycenaean singers starting in the 18th century&n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Titan (mythology)
In Greek mythology, the Titans ( ; ) were the pre- Olympian gods. According to the ''Theogony'' of Hesiod, they were the twelve children of the primordial parents Uranus (Sky) and Gaia (Earth). The six male Titans were Oceanus, Coeus, Crius, Hyperion, Iapetus, and Cronus; the six female Titans—called the Titanides () or Titanesses—were Theia, Rhea, Themis, Mnemosyne, Phoebe, and Tethys. After Cronus mated with his older sister Rhea, she bore the first generation of Olympians: the six siblings Zeus, Hades, Poseidon, Hestia, Demeter, and Hera. Certain other descendants of the Titans, such as Prometheus, Atlas, Helios, and Leto, are sometimes also called Titans. The Titans were the former gods: the generation of gods preceding the Olympians. They were overthrown as part of the Greek succession myth, which tells how Cronus seized power from his father Uranus and ruled the cosmos with his fellow Titans before being in turn defeated and replaced as the ruling pantheon o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
