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English Wikipedia references for Johnstonsarchive.net 1-20 of 279
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| Albedo The albedo of an object is the extent to which it diffusely reflects light from the Sun. It is therefore a more specific form of the term reflectivity. Albedo is defined as diffusely reflected to incident electromagnetic radiation. It is a unitless measure indicative of a surface's or body's diffuse reflectivity. The word is derived from Latin albedo "whiteness", in turn from albus "white", and was introduced into optics Johann Heinrich Lambert in his 1760 work Photometria. Albedo | |
| Abortion An abortion is the termination of a pregnancy by the removal or expulsion from the uterus of a fetus/embryo, resulting in or caused by its death. An abortion can occur spontaneously due to complications during pregnancy or can be induced, in humans and other species. Abortion | |
| Comet A comet is a Small Solar System Body that orbits the Sun. When close enough to the Sun, a comet exhibits a visible coma (fuzzy "atmosphere"), and sometimes a tail, both because of the effects of solar radiation upon the comet's nucleus. Comet nuclei are themselves loose collections of ice, dust and small rocky particles, ranging from a few kilometers to tens of kilometers across. Comet | |
| Classical Kuiper belt object In astronomy a classical Kuiper Belt object, also called a cubewano, is a Kuiper belt object (KBO) that orbits beyond Neptune and is not controlled by an orbital resonance with the giant planet. Cubewanos have semi-major axes in the 40-50 AU range and, unlike Pluto, do not cross Neptune’s orbit.The name "cubewano" derives from the first trans-Neptunian object (TNO) found after Pluto and Charon, . Later similar objects were called "QB1-o's", or "cubewanos". Classical_Kuiper_belt_object | |
| Geyser A geyser is a hot spring characterized by intermittent discharge of water ejected turbulently and accompanied by a vapour phase (steam). The name geyser comes from Geysir, the name of an erupting spring at Haukadalur, Iceland; that name, in turn, comes from the Icelandic verb gjósa, "to gush". Geyser | |
| Kuiper belt The Kuiper belt (, rhyming with "viper"), sometimes called the Edgeworth-Kuiper belt, is a region of the Solar System beyond the planets extending from the orbit of Neptune (at 30 AU) to approximately 55 AU from the Sun. It is similar to the asteroid belt, although it is far larger—20 times as wide and 20–200 times as massive. Kuiper_belt | |
| Trans-Neptunian object A trans-Neptunian object (TNO) is any object in the Solar System that orbits the Sun at a greater distance on average than Neptune. The Kuiper belt, scattered disk, and Oort cloud are three divisions of this volume of space.The first trans-Neptunian object to be discovered was Pluto in 1930. Trans-Neptunian_object | |
| Pluto Pluto | |
| 2 Pallas 2_Pallas | |
| Natural satellite natural satellite or moon is a celestial body that orbits a planet or smaller body, which is called the primary. Technically, the term natural satellite could refer to a planet orbiting a star, or a dwarf galaxy orbiting a major galaxy, but it is normally synonymous with moon and used to identify non-artificial satellites of planets, dwarf planets, and minor planets., Natural_satellite | |
| Natural satellite Talk:Natural_satellite | |
| Operation Argus Operation Argus was a series of nuclear weapons tests and missile tests secretly conducted during August and September of 1958 over the South Atlantic Ocean by the United States's Defense Nuclear Agency, in conjunction with the Explorer 4 space mission. Operation Argus was conducted between the nuclear test series Operation Hardtack I and Operation Hardtack II. Operation_Argus | |
| List of artificial radiation belts List_of_artificial_radiation_belts | |
| Radiation poisoning Radiation poisoning, also called "radiation sickness" or a "creeping dose", is a form of damage to organ tissue due to excessive exposure to ionizing radiation. The term is generally used to refer to acute problems caused by a large dosage of radiation in a short period, though this also has occurred with long term exposure. Radiation_poisoning | |
| Minor planet moon minor planet moon is a minor planet that orbits another minor planet as its natural satellite. It is thought that many asteroids and Kuiper belt objects may possess moons, in some cases quite substantial in size. Discoveries of asteroid moons (and binary objects, in general) are important because the determination of their orbits provides estimates on the mass and density of the primary, allowing insights of their physical properties that is generally not otherwise possible. Minor_planet_moon | |
| Pioneer plaque Pioneer plaques are a pair of gold anodized aluminum plaques which were placed on board the 1972 Pioneer 10 and 1973 Pioneer 11 spacecraft, featuring a pictorial message, in case either Pioneer 10 or 11 are intercepted by extraterrestrial beings. The plaques show the nude figures of a human male and female along with several symbols that are designed to provide information about the origin of the spacecraft. Pioneer_plaque | |
| Abortion debate The abortion debate refers to discussion and controversy surrounding the moral and legal status of abortion. The two main groups involved in the abortion debate are the pro-choice movement, which supports access to abortion and regards it as morally permissible, and the pro-life movement, which generally opposes access to abortion and regards it as morally wrong. Abortion_debate | |
| Geyser Talk:Geyser | |
| 28978 Ixion 28978_Ixion | |
| Nuclear and radiation accidents This article covers notable accidents involving nuclear devices and radioactive materials. These accidents can hurt or kill almost anything that is around it while the accident is happening. In some cases, a release of radioactive contamination occurs, but in many cases the accident involves a sealed source or the release of radioactivity is small while the direct irradiation is large. Nuclear_and_radiation_accidents |
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