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Blanet
A blanet is a member of a hypothetical class of exoplanets that directly orbit black holes. Blanets are fundamentally similar to other planets; they have enough mass to be rounded by their own gravity, but are not massive enough to start thermonuclear fusion and become stars. In 2019, a team of astronomers and exoplanetologists showed that there is a safe zone around a supermassive black hole that could harbor thousands of blanets in orbit around it. Etymology The team led by Keiichi Wada of Kagoshima University in Japan has given this name to black hole planets. The word is a portmanteau of ''black hole'' and ''planet''. Formation Blanets are suspected to form in the accretion disk that orbits a sufficiently large black hole. Possible candidates * The unconfirmed extragalactic planet M51-ULS-1b. * The unconfirmed planet or brown dwarf, IGR J12580+0134 b, being disrupted by a supermassive black hole. In fiction * In the two episodes " The Impossible Planet" and " Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Holes
A black hole is a massive, compact astronomical object so dense that its gravity prevents anything from escaping, even light. Albert Einstein's theory of general relativity predicts that a sufficiently compact mass will form a black hole. The boundary of no escape is called the event horizon. A black hole has a great effect on the fate and circumstances of an object crossing it, but has no locally detectable features according to general relativity. In many ways, a black hole acts like an ideal black body, as it reflects no light. Quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is of the order of billionths of a kelvin for stellar black holes, making it essentially impossible to observe directly. Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interstellar (film)
''Interstellar'' is a 2014 epic science fiction film directed by Christopher Nolan, who co-wrote the screenplay with his brother Jonathan. It features an ensemble cast led by Matthew McConaughey, Anne Hathaway, Jessica Chastain, Bill Irwin, Ellen Burstyn, and Michael Caine. Set in a dystopian future where Earth is suffering from catastrophic blight and famine, the film follows a group of astronauts who travel through a wormhole near Saturn in search of a new home for mankind. The screenplay had its origins in a script Jonathan developed in 2007 and was originally set to be directed by Steven Spielberg. Theoretical physicist Kip Thorne was an executive producer and scientific consultant on the film, and wrote the tie-in book '' The Science of Interstellar''. It was Lynda Obst's final film as producer before her death. Cinematographer Hoyte van Hoytema shot it on 35 mm film in the Panavision anamorphic format and IMAX 70 mm. Filming began in late 2013 and took ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portmanteau
In linguistics, a blend—also known as a blend word, lexical blend, or portmanteau—is a word formed by combining the meanings, and parts of the sounds, of two or more words together.Garner's Modern American Usage p. 644. English examples include '' smog'', coined by blending ''smoke'' and ''fog'', and '''', from ''motor'' ('' motorist'') and ''hotel''. A blend is similar to a [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hypothetical Planet Types
A hypothesis (: hypotheses) is a proposed explanation for a phenomenon. A scientific method, scientific hypothesis must be based on observations and make a testable and reproducible prediction about reality, in a process beginning with an educated guess or thought. If a hypothesis is repeatedly independently demonstrated by experiment to be true, it becomes a scientific theory. In colloquial usage, the words "hypothesis" and "theory" are often used interchangeably, but this is incorrect in the context of science. A working hypothesis is a provisionally-accepted hypothesis used for the purpose of pursuing further progress in research. Working hypotheses are frequently discarded, and often proposed with knowledge (and Research ethics, warning) that they are incomplete and thus false, with the intent of moving research in at least somewhat the right direction, especially when scientists are stuck on an issue and brainstorming ideas. A different meaning of the term ''hypothesis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exoplanetology
This page describes exoplanet orbital and physical parameters. Orbital parameters Most known extrasolar planet candidates have been discovered using indirect methods and therefore only some of their physical and orbital parameters can be determined. For example, out of the six independent orbital element, parameters that define an orbit, the radial-velocity method can determine four: semi-major axis, orbital eccentricity, eccentricity, longitude of periastron, and time of periastron. Two parameters remain unknown: inclination and longitude of the ascending node. Distance from star and orbital period There are exoplanets that are much closer to their parent star than any planet in the Solar System is to the Sun, and there are also exoplanets that are much further from their star. Mercury (planet), Mercury, the closest planet to the Sun at 0.4 astronomical units (AU), takes 88 days for an orbit, but the smallest known orbits of exoplanets have orbital periods of only a few ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Main Sequence
In astronomy, the main sequence is a classification of stars which appear on plots of stellar color index, color versus absolute magnitude, brightness as a continuous and distinctive band. Stars on this band are known as main-sequence stars or dwarf stars, and positions of stars on and off the band are believed to indicate their physical properties, as well as their progress through several types of star life-cycles. These are the most numerous true stars in the universe and include the Sun. Color-magnitude plots are known as Hertzsprung–Russell diagrams after Ejnar Hertzsprung and Henry Norris Russell. After condensation and ignition of a star, it generates thermal energy in its dense stellar core, core region through nuclear fusion of hydrogen into helium. During this stage of the star's lifetime, it is located on the main sequence at a position determined primarily by its mass but also based on its chemical composition and age. The cores of main-sequence stars are in hydros ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doctor Who
''Doctor Who'' is a British science fiction television series broadcast by the BBC since 1963. The series, created by Sydney Newman, C. E. Webber and Donald Wilson (writer and producer), Donald Wilson, depicts the adventures of an extraterrestrial being called the Doctor, part of a humanoid species called Time Lords. The Doctor travels in the universe and in time using a time travelling Spacecraft, spaceship called the TARDIS, which externally appears as a British police box. While travelling, the Doctor works to save lives and liberate oppressed peoples by combating List of Doctor Who villains, foes. The Doctor usually travels with Companion (Doctor Who), companions. Beginning with William Hartnell, List of actors who have played the Doctor, fourteen actors have headlined the series as the Doctor; the most recent being Ncuti Gatwa, who portrayed the Fifteenth Doctor from 2023 to 2025. The transition between actors is written into the plot of the series with the Regeneration ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Satan Pit
"The Satan Pit" is the ninth episode of the second series of the British science fiction television series ''Doctor Who'', which was first broadcast on 10 June 2006. It is the second part of a two-part story. The first part, " The Impossible Planet", was broadcast on 3 June. The episode is set on Krop Tor, a planet orbiting a black hole. In the episode, the alien time traveller the Tenth Doctor (David Tennant) climbs down a deep pit in which the Beast (Gabriel Woolf) is kept prisoner. At the same time, the Doctor's travelling companion Rose Tyler (Billie Piper) and a human expedition team try to escape the planet after the Beast possesses the Ood on the base. Plot The Tenth Doctor and science officer Ida investigate a pit under a recently opened trap door deep in the planet Krop Tor. In the sanctuary base, Rose and three members of the crew, Jefferson, Danny, and Toby, flee from the advancing Ood, who are possessed by the Beast. Toby appears to be no longer possessed. As the Doct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Impossible Planet
"The Impossible Planet" is the eighth episode of the second series of the British science fiction television series ''Doctor Who'', which was first broadcast on BBC One on 3 June 2006. It is the first part of a two-part story. The second part, "The Satan Pit", was broadcast on 10 June. The episode is set on Krop Tor, a planet orbiting a black hole. In the episode, a human expedition group drilling on the planet is terrorised by a creature calling itself the Beast (voiced by Gabriel Woolf), which possesses the Ood slaves in the humans' base. Plot The TARDIS arrives aboard a sanctuary base used for deep-space expeditions. The Tenth Doctor and Rose explore the area, discovering strange alien writing that the TARDIS is unable to translate, meaning that it is "impossibly old". They are confronted by the Ood, a docile race of empathic slaves who work on the station. After a misunderstanding with the Ood, the Doctor and Rose meet the crew of the base: commanding officer Zach, scienti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brown Dwarf
Brown dwarfs are substellar objects that have more mass than the biggest gas giant planets, but less than the least massive main sequence, main-sequence stars. Their mass is approximately 13 to 80 Jupiter mass, times that of Jupiter ()not big enough to sustain nuclear fusion of hydrogen into helium in their cores, but massive enough to emit some light and heat from the deuterium fusion, fusion of deuterium (deuterium, 2H). The most massive ones (> ) can lithium burning, fuse lithium (lithium-7, 7Li). Astronomers classify self-luminous objects by Stellar classification#Spectral types, spectral type, a distinction intimately tied to the surface temperature, and brown dwarfs occupy types M (2100–3500 Kelvin, K), L (1300–2100 Kelvin, K), T (600–1300 Kelvin, K), and Y ( 80 ''M''J), which have spectral classes L2 to L6. Spectral class T As GD 165B is the prototype of the L dwarfs, Gliese 229B is the prototype of a second ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M51-ULS-1b
The Whirlpool Galaxy, also known as Messier 51a (M51a) or NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus. It lies in the constellation Canes Venatici, and was the first galaxy to be classified as a spiral galaxy. It is 31 million lightyears (9.5 megaparsecs/Mpc) away and in diameter. The galaxy and its companion, NGC 5195, are easily observed by amateur astronomers, and the two galaxies may be seen with binoculars. The Whirlpool Galaxy has been extensively observed by professional astronomers, who study it and its pair with dwarf galaxy NGC 5195 to understand galaxy structure (particularly structure associated with the spiral arms) and galaxy interactions. Its pair with NGC 5195 is among the most famous and relatively close interacting systems, and thus is a favorite subject of galaxy interaction models. Discovery What later became known as the Whirlpool Galaxy was discovered on October 13, 1773, by Charles Messier while h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
