92 relations: Alphard, Antarctica, Antlia, Aperture, Apollo, Arabic, Ashlesha (nakshatra), Azure Dragon, Babylonian astronomy, Barred spiral galaxy, Beta Hydrae, Binary star, Cancer (constellation), Canis Minor, Centaurus, Chinese constellations, Clyde Tombaugh, Constellation, Constellation family, Corvus (constellation), Crater (constellation), Crow, Culture, Epsilon Hydrae, ESO 510-G13, Exoplanet, Full moon, Galaxy merger, Gamma Hydrae, Giant star, Globular cluster, Grand design spiral galaxy, GW170817, Hercules, Hercules (constellation), Hybrid beasts in folklore, Hydrus, Japanese language, Jupiter, Leo (constellation), Lernaean Hydra, LHS 3003, Libra (constellation), LIGO Scientific Collaboration, Lupus (constellation), Messier 48, Messier 68, Messier 83, Messier object, Mira variable, ..., Monoceros, MUL.APIN, Nakshatra, Neutron star, NGC 3242, NGC 3314, NGC 4993, NGC 5068, NGC 5694, Open cluster, Pi Hydrae, Planetary nebula, Princeton University Press, Prometheus Books, Ptolemy, Puppis, Pyxis, R Hydrae, Science (journal), Sea serpent, Serpens, Sextans, Sigma Hydrids, Snake, Spiral galaxy, Star, Supernova, U Hydrae, V Hydrae, Variable star, Vermilion Bird, Virgo (constellation), Virgo interferometer, Water snake, William Herschel, Yellow giant, 1 Centauri, 2 Centauri, 27 Hydrae, 3 Centauri, 4 Centauri, 54th parallel north. Expand index (42 more) » « Shrink index
Alphard, also designated Alpha Hydrae (α Hydrae, abbreviated Alpha Hya, α Hya) is the brightest star in the constellation of Hydra.
Antarctica is Earth's southernmost continent.
Antlia (from Ancient Greek ἀντλία) is a constellation in the Southern Celestial Hemisphere.
In optics, an aperture is a hole or an opening through which light travels.
Apollo (Attic, Ionic, and Homeric Greek: Ἀπόλλων, Apollōn (Ἀπόλλωνος); Doric: Ἀπέλλων, Apellōn; Arcadocypriot: Ἀπείλων, Apeilōn; Aeolic: Ἄπλουν, Aploun; Apollō) is one of the most important and complex of the Olympian deities in classical Greek and Roman religion and Greek and Roman mythology.
Arabic (العَرَبِيَّة) or (عَرَبِيّ) or) is a Central Semitic language that first emerged in Iron Age northwestern Arabia and is now the lingua franca of the Arab world. It is named after the Arabs, a term initially used to describe peoples living from Mesopotamia in the east to the Anti-Lebanon mountains in the west, in northwestern Arabia, and in the Sinai peninsula. Arabic is classified as a macrolanguage comprising 30 modern varieties, including its standard form, Modern Standard Arabic, which is derived from Classical Arabic. As the modern written language, Modern Standard Arabic is widely taught in schools and universities, and is used to varying degrees in workplaces, government, and the media. The two formal varieties are grouped together as Literary Arabic (fuṣḥā), which is the official language of 26 states and the liturgical language of Islam. Modern Standard Arabic largely follows the grammatical standards of Classical Arabic and uses much of the same vocabulary. However, it has discarded some grammatical constructions and vocabulary that no longer have any counterpart in the spoken varieties, and has adopted certain new constructions and vocabulary from the spoken varieties. Much of the new vocabulary is used to denote concepts that have arisen in the post-classical era, especially in modern times. During the Middle Ages, Literary Arabic was a major vehicle of culture in Europe, especially in science, mathematics and philosophy. As a result, many European languages have also borrowed many words from it. Arabic influence, mainly in vocabulary, is seen in European languages, mainly Spanish and to a lesser extent Portuguese, Valencian and Catalan, owing to both the proximity of Christian European and Muslim Arab civilizations and 800 years of Arabic culture and language in the Iberian Peninsula, referred to in Arabic as al-Andalus. Sicilian has about 500 Arabic words as result of Sicily being progressively conquered by Arabs from North Africa, from the mid 9th to mid 10th centuries. Many of these words relate to agriculture and related activities (Hull and Ruffino). Balkan languages, including Greek and Bulgarian, have also acquired a significant number of Arabic words through contact with Ottoman Turkish. Arabic has influenced many languages around the globe throughout its history. Some of the most influenced languages are Persian, Turkish, Spanish, Urdu, Kashmiri, Kurdish, Bosnian, Kazakh, Bengali, Hindi, Malay, Maldivian, Indonesian, Pashto, Punjabi, Tagalog, Sindhi, and Hausa, and some languages in parts of Africa. Conversely, Arabic has borrowed words from other languages, including Greek and Persian in medieval times, and contemporary European languages such as English and French in modern times. Classical Arabic is the liturgical language of 1.8 billion Muslims and Modern Standard Arabic is one of six official languages of the United Nations. All varieties of Arabic combined are spoken by perhaps as many as 422 million speakers (native and non-native) in the Arab world, making it the fifth most spoken language in the world. Arabic is written with the Arabic alphabet, which is an abjad script and is written from right to left, although the spoken varieties are sometimes written in ASCII Latin from left to right with no standardized orthography.
Ashlesha (Sanskrit: आश्लेषा or Āśleṣā) is the 9th of the 27 nakshatras in Hindu astrology.
The Azure Dragon (青龍 Qīnglóng), also known as Bluegreen Dragon, Green Dragon, or also called the Blue Dragon (蒼龍 Cānglóng), is one of the Dragon Gods who represent the mount or chthonic forces of the Five Forms of the Highest Deity (五方上帝 Wǔfāng Shàngdì).
The history of astronomy in Mesopotamia, and the world, begins with the Sumerians who developed the earliest writing system—known as cuneiform—around 3500–3200 BC.
A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars.
Beta Hydrae (Beta Hya, β Hydrae, β Hya) is a double star in the constellation of Hydra.
A binary star is a star system consisting of two stars orbiting around their common barycenter.
Cancer is one of the twelve constellations of the zodiac.
Canis Minor is a small constellation in the northern celestial hemisphere.
Centaurus is a bright constellation in the southern sky.
Traditional Chinese astronomy has a system of dividing the celestial sphere into asterisms or constellations, known as "officials" (Chinese xīng guān).
Clyde William Tombaugh (February 4, 1906January 17, 1997) was an American astronomer.
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
Constellation families are collections of constellations sharing some defining characteristic, such as proximity on the celestial sphere, common historical origin, or common mythological theme.
Corvus is a small constellation in the Southern Celestial Hemisphere.
Crater is a small constellation in the Southern Celestial Hemisphere.
A Crow is a bird of the genus Corvus, or more broadly is a synonym for all of Corvus.
Culture is the social behavior and norms found in human societies.
Epsilon Hydrae (ε Hydrae, abbreviated Epsilon Hya, ε Hya) is a is a multiple star system of a combined third magnitude in the constellation of Hydra.
ESO 510-G13 is a spiral galaxy approximately 150 million light-years away in the constellation Hydra.
An exoplanet or extrasolar planet is a planet outside our solar system.
The full moon is the lunar phase when the Moon appears fully illuminated from Earth's perspective.
Galaxy mergers can occur when two (or more) galaxies collide.
Gamma Hydrae (γ Hya, γ Hydrae) is a star in the equatorial constellation of Hydra.
A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
A grand design spiral galaxy is a type of spiral galaxy with prominent and well-defined spiral arms, as opposed to multi-arm and flocculent spirals which have subtler structural features.
GW170817 was a gravitational wave (GW) signal observed by the LIGO and Virgo detectors on 17 August 2017.
Hercules is a Roman hero and god.
Hercules is a constellation named after Hercules, the Roman mythological hero adapted from the Greek hero Heracles.
Hybrid beasts appear in the folklore of a variety of cultures as legendary creatures.
Hydrus is a small constellation in the deep southern sky.
is an East Asian language spoken by about 128 million people, primarily in Japan, where it is the national language.
Jupiter is the fifth planet from the Sun and the largest in the Solar System.
Leo is one of the constellations of the zodiac, lying between Cancer the crab to the west and Virgo the maiden to the east.
The Lernaean Hydra or Hydra of Lerna (Λερναῖα Ὕδρα, Lernaîa Hýdra), more often known simply as the Hydra, was a serpentine water monster in Greek and Roman mythology.
LHS 3003 is a red dwarf star of spectral type M7.0V, located in constellation Hydra at 20.9 light-years from Earth.
Libra is a constellation of the zodiac.
The LIGO Scientific Collaboration (LSC) is a scientific collaboration of international physics institutes and research groups dedicated to the search for gravitational waves.
Lupus is a constellation located in the deep Southern Sky.
Messier 48 (also known as M 48 or NGC 2548) is an open cluster in the Hydra constellation.
Messier 68 (also known as M68 or NGC 4590) is a globular cluster in the equatorial constellation Hydra.
Messier 83 (also known as the Southern Pinwheel Galaxy, M83 or NGC 5236) is a barred spiral galaxy approximately 15 million light-years away in the constellation Hydra.
The Messier objects are a set of 110 astronomical objects, of which 103 were included in lists published by French astronomer Charles Messier in 1771 and 1781.
Mira variables ("Mira", Latin, adj. - feminine form of adjective "wonderful"), named for the prototype star Mira, are a class of pulsating variable stars characterized by very red colours, pulsation periods longer than 100 days, and amplitudes greater than one magnitude in infrared and 2.5 magnitude at visual wavelengths.
Monoceros (Greek: Μονόκερως) is a faint constellation on the celestial equator.
MUL.APIN is the conventional title given to a Babylonian compendium that deals with many diverse aspects of Babylonian astronomy and astrology.
Nakshatra (Sanskrit: नक्षत्र, IAST: Nakṣatra) is the term for lunar mansion in Hindu astrology.
A neutron star is the collapsed core of a large star which before collapse had a total of between 10 and 29 solar masses.
NGC 3242, commonly known as the Ghost of Jupiter, is a planetary nebula located in the constellation Hydra.
NGC 3314 is a pair of overlapping spiral galaxies between 117 and 140 million light-years away in the constellation Hydra.
NGC 4993 (also catalogued as NGC 4994) is an elliptical galaxy or lenticular galaxy located about 140 million light-years away in the constellation Hydra.
NGC 5068 is a face-on field barred spiral galaxy in the Virgo constellation.
NGC 5694 (also known as Caldwell 66) is a globular cluster in the constellation Hydra.
An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.
Pi Hydrae (π Hya, π Hydrae) is a star in the constellation Hydra with an apparent visual magnitude of 3.3, making it visible to the naked eye.
A planetary nebula, abbreviated as PN or plural PNe, is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives.
Princeton University Press is an independent publisher with close connections to Princeton University.
Prometheus Books is a publishing company founded in August 1969 by the philosopher Paul Kurtz (who was also the founder of the Council for Secular Humanism, Center for Inquiry, and co-founder of the Committee for Skeptical Inquiry).
Claudius Ptolemy (Κλαύδιος Πτολεμαῖος, Klaúdios Ptolemaîos; Claudius Ptolemaeus) was a Greco-Roman mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology.
Puppis is a constellation in the southern sky.
Pyxis is a small and faint constellation in the southern sky.
R Hydrae, also known as R Hya, is a Mira-type variable star in the constellation Hydra.
Science, also widely referred to as Science Magazine, is the peer-reviewed academic journal of the American Association for the Advancement of Science (AAAS) and one of the world's top academic journals.
A sea serpent or sea dragon is a type of dragon described in various mythologies, most notably Greek (Cetus, Echidna, Hydra, Scylla), Mesopotamian (Tiamat), Hebrew (Leviathan), and Norse (Jörmungandr).
Serpens ("the Serpent", Greek Ὄφις) is a constellation of the northern hemisphere.
Sextans is a minor equatorial constellation which was introduced in 1687 by Johannes Hevelius.
Sigma Hydrids are minor (faint) meteor shower with peak on 11 December.
Snakes are elongated, legless, carnivorous reptiles of the suborder Serpentes.
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae(pp. 124–151) and, as such, form part of the Hubble sequence.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
A supernova (plural: supernovae or supernovas, abbreviations: SN and SNe) is a transient astronomical event that occurs during the last stellar evolutionary stages of a star's life, either a massive star or a white dwarf, whose destruction is marked by one final, titanic explosion.
U Hydrae (U Hya) is a carbon star in the constellation Hydra.
V Hydrae (V Hya) is a carbon star in the constellation Hydra.
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
The Vermilion bird is one of the Four Symbols of the Chinese constellations.
Virgo is one of the constellations of the zodiac.
The Virgo interferometer is a large interferometer designed to detect gravitational waves predicted by the general theory of relativity.
Different snakes are called water snakes.
Frederick William Herschel, (Friedrich Wilhelm Herschel; 15 November 1738 – 25 August 1822) was a German-born British astronomer, composer and brother of fellow astronomer Caroline Herschel, with whom he worked.
A yellow giant is a luminous giant star of low or intermediate mass (roughly 0.5–11 solar masses (M)) in a late phase of its stellar evolution.
1 Centauri, or i Centauri, is a yellow-white hued binary star system in the southern constellation Centaurus.
2 Centauri is a star in the constellation Centaurus.
27 Hydrae is an evolved yellow giant star in the constellation of Hydra.
3 Centauri is a binary star in the constellation Centaurus.
4 Centauri is a star in the constellation Centaurus.
The 54th parallel north is a circle of latitude that is 54 degrees north of the Earth's equatorial plane.