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Moons Of Haumea
The outer Solar System planetoid Haumea has two known moons, Hiʻiaka and Namaka, named after Hawaiian goddesses. These small moons were discovered in 2005, from observations of Haumea made at the large telescopes of the W. M. Keck Observatory in Hawaii. Haumea's moons are unusual in a number of ways. They are thought to be part of its extended collisional family, which formed billions of years ago from icy debris after a large impact disrupted Haumea's ice mantle. Hiʻiaka, the larger, outermost moon, has large amounts of pure water ice on its surface, which is rare among Kuiper belt objects. Namaka, about one tenth the mass, has an orbit with surprising dynamics: it is unusually eccentric and appears to be greatly influenced by the larger satellite. History Two small satellites were discovered around Haumea (which was at that time still designated 2003 EL61) through observations using the W.M. Keck Observatory by a Caltech team in 2005. The outer and larger of the two sa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blitzen The Reindeer
In traditional festive legend and popular culture, Santa Claus's reindeer are said to pull a sleigh through the night sky to help Santa Claus deliver gifts to children on Christmas Eve. The number of reindeer characters, and the names given to them (if any) vary in different versions, but those frequently cited in the United States are the eight listed in Clement Clarke Moore's 1823 poem ''A Visit from St. Nicholas'', the work that is largely responsible for the reindeer becoming popularly known. In the poem the reindeers' names are given as Dasher, Dancer, Prancer, Vixen, Comet, Cupid, Donner and Blitzen. The popularity of Robert L. May's 1939 storybook ''Rudolph the Red-Nosed Reindeer'', and Gene Autry's 1949 Christmas song "Rudolph the Red-Nosed Reindeer", resulted in Rudolph often being included as the ninth character. Many other variations in reindeer names and number have appeared in fiction, music, film and TV. Origins and history Single reindeer The first referen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Infrared
Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of visible light. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from around 1 millimeter (300 GHz) to the nominal red edge of the visible spectrum, around 700 nanometers (430 THz). Longer IR wavelengths (30 μm-100 μm) are sometimes included as part of the terahertz radiation range. Almost all black-body radiation from objects near room temperature is at infrared wavelengths. As a form of electromagnetic radiation, IR propagates energy and momentum, exerts radiation pressure, and has properties corresponding to both those of a wave and of a particle, the photon. It was long known that fires emit invisible heat; in 1681 the pioneering experimenter Edme Mariotte showed that glass, though transparent to sunlight, obstructed radiant heat. In 1800 the astronomer Sir William Herschel discovered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micrometre
The micrometre ( international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length in the International System of Units (SI) equalling (SI standard prefix "micro-" = ); that is, one millionth of a metre (or one thousandth of a millimetre, , or about ). The nearest smaller common SI unit is the nanometre, equivalent to one thousandth of a micrometre, one millionth of a millimetre or one billionth of a metre (). The micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells and bacteria, and for grading wool by the diameter of the fibres. The width of a single human hair ranges from approximately 20 to . The longest human chromosome, chromosome 1, is approximately in length. Examples Between 1 μm and 10 μm: * 1–10 μm – length of a typical bacterium * 3–8 μm – width of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2003 EL61 Haumea, With Moons
3 (three) is a number, numeral and digit. It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number. It has religious or cultural significance in many societies. Evolution of the Arabic digit The use of three lines to denote the number 3 occurred in many writing systems, including some (like Roman and Chinese numerals) that are still in use. That was also the original representation of 3 in the Brahmic (Indian) numerical notation, its earliest forms aligned vertically. However, during the Gupta Empire the sign was modified by the addition of a curve on each line. The Nāgarī script rotated the lines clockwise, so they appeared horizontally, and ended each line with a short downward stroke on the right. In cursive script, the three strokes were eventually connected to form a glyph resembling a with an additional stroke at the bottom: ३. The Indian digits spread to the Caliphate in the 9th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hill Sphere
The Hill sphere of an astronomical body is the region in which it dominates the attraction of satellites. To be retained by a planet, a moon must have an orbit that lies within the planet's Hill sphere. That moon would, in turn, have a Hill sphere of its own. Any object within that distance would tend to become a satellite of the moon, rather than of the planet itself. One simple view of the extent of the Solar System is the Hill sphere of the Sun with respect to local stars and the galactic nucleus. In more precise terms, the Hill sphere approximates the gravitational sphere of influence of a smaller body in the face of perturbations from a more massive body. It was defined by the American astronomer George William Hill, based on the work of the French astronomer Édouard Roche. In the example to the right, the Earth's Hill sphere extends between the Lagrange points and , which lie along the line of centers of the two bodies. The region of influence of the smaller body is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hubble Space Telescope
The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned both as a vital research tool and as a public relations boon for astronomy. The Hubble telescope is named after astronomer Edwin Hubble and is one of NASA's Great Observatories. The Space Telescope Science Institute (STScI) selects Hubble's targets and processes the resulting data, while the Goddard Space Flight Center (GSFC) controls the spacecraft. Hubble features a mirror, and its five main instruments observe in the ultraviolet, visible, and near-infrared regions of the electromagnetic spectrum. Hubble's orbit outside the distortion of Earth's atmosphere allows it to capture extremely high-resolution images with substantially lower background light than ground-based telescopes. It has recorded some of the most detaile ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pele (deity)
In Hawaiian religion, Pele (pronounced ) is the goddess of volcanoes and fire and the creator of the Hawaiian Islands. Often referred to as "Madame Pele" or "Tūtū Pele" as a sign of respect, she is a well-known deity within Hawaiian mythology and is notable for her contemporary presence and cultural influence as an enduring figure from ancient Hawaii. Epithets of the goddess include ''Pele-honua-mea'' ("Pele of the sacred land") and ''Ka wahine ʻai honua'' ("The earth-eating woman"). In different stories talking about the goddess Pele, she was born from the female spirit named Haumea. This spirit is important when talking about Hawaiʻi's gods as she descended from Papa, or Earth Mother, and Wakea, Sky Father, both descendants of the supreme beings. Pele is also known as "She who shapes the sacred land," known to be said in ancient Hawaiian chants. The first published stories of Pele were written by William Ellis. Legends Kīlauea is a currently active volcano that is locat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nāmaka
In Hawaiian mythology, Nāmaka (or Nā-maka-o-Kahai, the eyes of Kahai) appears as a sea goddess in the Pele family. She is an older sister of Pele-honua-mea. She is the daughter of Ku-waha-ilo and Haumea, whose other children are Pele, the Hiʻiaka sisters, the Kama brothers, and the bird Halulu. Aukelenuiaiku becomes Namaka's husband in Kahiki, but then later the husband of Pele, and because of this Pele, the Hiiaka sisters, Malulani, and Kaʻōhelo migrate to Hawaii. When Pele quarrels with her powerful sister Namaka, Namaka sends tidal waves to destroy Pele's lands and homes. Helped by her family, Pele fights Namaka, but Namaka defeats her. The Star Bulletin, 26 September 2005 In [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mauna Kea Observatory
The Mauna Kea Observatories (MKO) are a group of independent astronomical research facilities and large telescope observatories that are located at the summit of Mauna Kea on the Big Island of Hawaiʻi, United States. The facilities are located in a 525-acre (212 ha) special land use zone known as the "Astronomy Precinct", which is located within the 11,228-acre (4,544 ha) Mauna Kea Science Reserve. The Astronomy Precinct was established in 1967 and is located on land protected by the Historical Preservation Act for its significance to Hawaiian culture. The presence and continued construction of telescopes is highly controversial due to Mauna Kea's centrality in native Hawaiian religion and culture, as well as for a variety of environmental reasons. The location is near ideal because of its dark skies from lack of light pollution, good astronomical seeing, low humidity, high elevation of , position above most of the water vapor in the atmosphere, clean air, good weath ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Big Island Of Hawaii
Hawaii ( ; haw, Hawaii ) is the List of islands of the United States by area, largest island in the United States, located in the U.S. state, state of Hawaii. It is the southeasternmost of the Hawaiian Islands, a chain of High island, volcanic islands in the Pacific Ocean, North Pacific Ocean. With an area of , it has 63% of the Hawaiian archipelago's combined landmass. However, it has only 13% of Hawaiʻi's population. The island of Hawaiʻi is the third largest island in Polynesia, behind the two main List of islands of New Zealand, islands of New Zealand. The island is often referred to as the Island of Hawaii or Hawaii Island to distinguish it from the state. It is also referred to as the Big Island. Administratively, the island is coextensive with Hawaii County, Hawaii, Hawaii County. As of the 2020 United States census, 2020 census, the population was 200,629. The county seat and largest town is Hilo, Hawaii, Hilo. There are no Municipal corporation, incorporated cities i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hula
Hula () is a Hawaiian dance form accompanied by chant (oli) or song (Mele (Hawaiian language), mele). It was developed in the Hawaiian Islands by the Native Hawaiians who originally settled there. The hula dramatizes or portrays the words of the oli or mele in a visual dance form. There are many sub-styles of hula, with the main two categories being Hula ʻAuana and Hula Kahiko. Ancient hula, as performed before Western encounters with Hawaii, is called ''kahiko''. It is accompanied by chant and traditional instruments. Hula, as it evolved under Western influence in the 19th and 20th centuries, is called ''auana'' (a word that means "to wander" or "drift"). It is accompanied by song and Western-influenced musical instruments such as the guitar, the ukulele, ukulele, and the double bass. Terminology for two main additional categories is beginning to enter the hula lexicon: "Monarchy" includes any hula which were composed and choreographed during the 19th century. During that t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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