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The Ring Of Charon
''The Ring of Charon'' is a science fiction book by American writer Roger MacBride Allen, first published in 1990 by Tor Books. It is the first in a series of three (although the third book has yet to be published) books under the name of ''The Hunted Earth''. goodreads.com The story unfolds as an unknown alien race captures with the use of a controlled , which was triggered accidentally by experiments issued from a human outpos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roger MacBride Allen
Roger MacBride Allen (born September 26, 1957) is an American science fiction author. He was born in Bridgeport, Connecticut and grew up outside of Washington, D.C., graduating from Walt Whitman High School. He graduated from Boston University in 1979. His father is American historian and author Thomas B. Allen. Background Allen's family moved to Bethesda, Maryland when in 1966, when he was nine years old. He earned a degree in journalism from Boston University, after-which he returned to suburban Washington DC. Works ''Allies and Aliens'' *'' The Torch of Honor'' (1985) *'' Rogue Powers'' (1986) **'' Allies and Aliens'' (1995) collects ''The Torch of Honor'' and ''Rogue Powers'' ''Hunted Earth'' *'' The Ring of Charon'' (1990) *'' The Shattered Sphere'' (1994) *'' The Falling World'' (TBA) ''Caliban'' *'' Isaac Asimov's Caliban'' (1993) *'' Isaac Asimov's Inferno'' (1994) *'' Isaac Asimov's Utopia'' (1996) ''Chronicles of Solace'' *'' The Depths of Time'' (2000) *'' The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dyson Sphere
A Dyson sphere is a hypothetical megastructure that completely encompasses a star and captures a large percentage of its solar power output. The concept is a thought experiment that attempts to explain how a spacefaring civilization would meet its energy requirements once those requirements exceed what can be generated from the home planet's resources alone. Because only a tiny fraction of a star's energy emissions reaches the surface of any orbiting planet, building structures encircling a star would enable a civilization to harvest far more energy. The first contemporary description of the structure was by Olaf Stapledon in his science fiction novel '' Star Maker'' (1937), in which he described "every solar system... surrounded by a gauze of light-traps, which focused the escaping solar energy for intelligent use". The concept was later popularized by Freeman Dyson in his 1960 paper "Search for Artificial Stellar Sources of Infrared Radiation". Dyson speculated that such stru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Venus
Venus is the second planet from the Sun. It is sometimes called Earth's "sister" or "twin" planet as it is almost as large and has a similar composition. As an interior planet to Earth, Venus (like Mercury) appears in Earth's sky never far from the Sun, either as morning star or evening star. Aside from the Sun and Moon, Venus is the brightest natural object in Earth's sky, capable of casting visible shadows on Earth at dark conditions and being visible to the naked eye in broad daylight. Venus is the second largest terrestrial object of the Solar System. It has a surface gravity slightly lower than on Earth and has a very weak induced magnetosphere. The atmosphere of Venus, mainly consists of carbon dioxide, and is the densest and hottest of the four terrestrial planets at the surface. With an atmospheric pressure at the planet's surface of about 92 times the sea level pressure of Earth and a mean temperature of , the carbon dioxide gas at Venus's surface is in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tycho (crater)
Tycho () is a prominent lunar impact crater located in the southern lunar highlands, named after the Danish astronomer Tycho Brahe (1546–1601)., accessed 19 February 2019 It is estimated to be 108 million years old. To the south of Tycho is the crater Street, to the east is Pictet, and to the north-northeast is Sasserides. The surface around Tycho is replete with craters of various sizes, many overlapping still older craters. Some of the smaller craters are secondary craters formed from larger chunks of ejecta from Tycho. It is one of the Moon's brightest craters, with a diameter of and a depth of . Age and description Tycho is a relatively young crater, with an estimated age of 108 million years ( Ma), based on analysis of samples of the crater ray recovered during the Apollo 17 mission. This age initially suggested that the impactor may have been a member of the Baptistina family of asteroids, but as the composition of the impactor is unknown this remained conjecture. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prison Colony
A penal colony or exile colony is a settlement used to exile prisoners and separate them from the general population by placing them in a remote location, often an island or distant colonial territory. Although the term can be used to refer to a correctional facility located in a remote location, it is more commonly used to refer to communities of prisoners overseen by wardens or governors having absolute authority. Historically penal colonies have often been used for penal labour in an economically underdeveloped part of a state's (usually colonial) territories, and on a far larger scale than a prison farm. British Empire With the passage of the Transportation Act 1717, the British government initiated the penal transportation of indentured servants to Britain's colonies in the Americas. British merchants would be in charge of transporting the convicts across the Atlantic, where in the colonies their indentures would be auctioned off to planters. Many of the indentured s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Particle Accelerator
A particle accelerator is a machine that uses electromagnetic fields to propel charged particles to very high speeds and energies, and to contain them in well-defined beams. Large accelerators are used for fundamental research in particle physics. The largest accelerator currently active is the Large Hadron Collider (LHC) near Geneva, Switzerland, operated by the CERN. It is a collider accelerator, which can accelerate two beams of protons to an energy of 6.5 TeV and cause them to collide head-on, creating center-of-mass energies of 13 TeV. Other powerful accelerators are, RHIC at Brookhaven National Laboratory in New York and, formerly, the Tevatron at Fermilab, Batavia, Illinois. Accelerators are also used as synchrotron light sources for the study of condensed matter physics. Smaller particle accelerators are used in a wide variety of applications, including particle therapy for oncological purposes, radioisotope production for medical diagnostics, ion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terraforming Of Venus
The terraforming of Venus or the terraformation of Venus is the hypothetical process of engineering the global environment of the planet Venus in such a way as to make it suitable for human habitation. Terraforming Venus was first proposed in a scholarly context by the astronomer Carl Sagan in 1961, although fictional treatments, such as ''The Big Rain'' of The Psychotechnic League by novelist Poul Anderson, preceded it. Adjustments to the existing environment of Venus to support human life would require at least three major changes to the planet's atmosphere: # Reducing Venus's surface temperature of # Eliminating most of the planet's dense carbon dioxide and sulfur dioxide atmosphere via removal or conversion to some other form # The addition of breathable oxygen to the atmosphere. These three changes are closely interrelated because Venus's extreme temperature is due to the high pressure of its dense atmosphere and the greenhouse effect. History Prior to the early 1960s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mercury (planet)
Mercury is the smallest planet in the Solar System and the closest to the Sun. Its orbit around the Sun takes 87.97 Earth days, the shortest of all the Sun's planets. It is named after the Roman god ' ( Mercury), god of commerce, messenger of the gods, and mediator between gods and mortals, corresponding to the Greek god Hermes (). Like Venus, Mercury orbits the Sun within Earth's orbit as an inferior planet, and its apparent distance from the Sun as viewed from Earth never exceeds 28°. This proximity to the Sun means the planet can only be seen near the western horizon after sunset or the eastern horizon before sunrise, usually in twilight. At this time, it may appear as a bright star-like object, but is more difficult to observe than Venus. From Earth, the planet telescopically displays the complete range of phases, similar to Venus and the Moon, which recurs over its synodic period of approximately 116 days. The synodic proximity of Mercury to Earth makes Mercury most ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planet Killer
Doomsday devices, when used in fiction, are capable of destroying anything from a civilization to an entire universe, and may be used for the purpose of mutually assured destruction, or as weapons in their own right. Examples of such devices include the Death Star from the '' Star Wars'' film franchise, the " Doomsday Machine" seen in the original '' Star Trek'' television series, or the atomic-powered stone burners from Frank Herbert's '' Dune'' franchise. Overview Planet killers function in a variety of ways depending on the series. Weapons such as the Death Star and the titular ship in ''Lexx'' use a directed energy weapon capable of obliterating a planet in moments. In the game '' Spore'', the Planet Buster is an antimatter bomb that is inserted in the center of the planet, causing the planet's core to split into countless fragments. Other weapons, such as the Shadow Planet Killer in ''Babylon 5'' and Covenant warships in the ''Halo'' series, render a planet uninhabitable. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Exposure
Venturing into the environment of space can have negative effects on the human body. Significant adverse effects of long-term weightlessness include muscle atrophy and deterioration of the skeleton (spaceflight osteopenia). Other significant effects include a slowing of cardiovascular system functions, decreased production of red blood cells (space anemia), balance disorders, eyesight disorders and changes in the immune system. Additional symptoms include fluid redistribution (causing the " moon-face" appearance typical in pictures of astronauts experiencing weightlessness), loss of body mass, nasal congestion, sleep disturbance, and excess flatulence. Overall, NASA refers to the various deleterious effects of spaceflight on the human body by the acronym RIDGE (i.e., "space radiation, isolation and confinement, distance from Earth, gravity fields, and hostile and closed environments"). The engineering problems associated with leaving Earth and developing space propulsion sy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autocracy
Autocracy is a system of government in which absolute power over a state is concentrated in the hands of one person, whose decisions are subject neither to external legal restraints nor to regularized mechanisms of popular control (except perhaps for the implicit threat of a coup d'état or other forms of rebellion). In earlier times, the term ''autocrat'' was coined as a favorable description of a ruler, having some connection to the concept of "lack of conflicts of interests" as well as an indication of grandeur and power. This use of the term continued into modern times, as the Russian Emperor was styled "Autocrat of all the Russias" as late as the early 20th century. In the 19th century, Eastern and Central Europe were under autocratic monarchies within the territories of which lived diverse peoples. Autocracy is the most common and durable regime type since the emergence of the state. History and etymology Autocracy comes from the Ancient Greek ''autos'' (Greek: αὐ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceres (dwarf Planet)
Ceres (; minor-planet designation: 1 Ceres) is a dwarf planet in the asteroid belt between the orbits of Mars and Jupiter. It was the first asteroid discovered, on 1 January 1801, by Giuseppe Piazzi at Palermo Astronomical Observatory in Sicily and announced as a new planet. Ceres was later classified as an asteroid and then a dwarf planetthe only one always inside Neptune's orbit. Ceres's small size means that even at its brightest, it is too dim to be seen by the naked eye, except under extremely dark skies. Its apparent magnitude ranges from 6.7 to 9.3, peaking at opposition (when it is closest to Earth) once every 15- to 16-month synodic period. As a result, its surface features are barely visible even with the most powerful telescopes, and little was known about it until the robotic NASA spacecraft ''Dawn'' approached Ceres for its orbital mission in 2015. ''Dawn'' found Ceres's surface to be a mixture of water ice, and hydrated minerals such as carbonates and clay. Gra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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