During the brightest full moons, the Moon can have an apparent magnitude of about −12.6. For comparison, the Sun has an apparent magnitude of −26.8. The Moon appears larger when close to the horizon. This is a purely psychological effect (see Moon illusion). The angular diameter of the Moon from Earth is about one half of one degree, and is actually about 1.5% smaller when the Moon is near the horizon than when it is high in the sky (beca ...

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Moon, Moon - The two sides, Moon - Orbit, Moon - Earth & Moon, Moon - Origin and history, Moon - Physical characteristics, Moon - Composition, Moon - Selenography, Moon - Presence of water, Moon - Magnetic field, Moon - Atmosphere, Moon - Eclipses, Moon - Occultation of stars, Moon - Observation of the Moon, Moon - Exploration of the Moon, Moon - Human understanding of the Moon, Moon - Myth and folk culture, Moon - The Moon as muse, Moon - Astrology, Moon - Scientific understanding, Moon - Meteor impact on the Moon, Moon - Legal status, Moon - Satellites, Moon - Surface installations, Moon - Lunar location listings

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Moon, Moon - The two sides of the Moon, Moon - Orbit, Moon - Earth & Moon, Moon - Tidal Effects, Moon - Double-planet hypotheses, Moon - Origin and history, Moon - Physical characteristics, Moon - Composition, Moon - Selenography, Moon - Presence of water, Moon - Magnetic field, Moon - Atmosphere, Moon - Eclipses, Moon - Occultation of stars, Moon - Observation of the Moon, Moon - Exploration of the Moon, Moon - Human understanding of the Moon, Moon - Myth and folk culture, Moon - The Moon as muse, Moon - Astrology, Moon - Scientific understanding, Moon - Meteor impact on the Moon, Moon - Legal status, Moon - Satellites, Moon - Surface installations, Moon - Lunar location listings

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In 1820, William Lassell started to make mirrors for his telescope and in 1844, made better mirrors that allowed him to discover the planet Neptune on September 23, 1846. When John Herschel received the news of the disovery, he wrote Lassell to search for moons of Neptune. Lassell started to search for the satellites and discovered Triton eight days after beginning to search, on 10 October, 1846, only 17 days after having discovered the planet Neptune. Even though Neptune has rings, they ...

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Triton moon, Triton moon - Name, Triton moon - Orbit, Triton moon - Physical characteristics, Triton moon - Seasons, Triton moon - Planetary geology, Triton moon - General Topography, Triton moon - “Cantaloupe terrain”, Triton moon - History of observation and exploration, Triton moon - Potential for life

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The Moon as seen from Earth Ammonia Carbon dioxide The Moon is the planet Earth's only natural satellite. It has no formal name other than "The Moon", although in English it is occasionally called Luna (Latin for moon), or Selene, to distinguish it from the generic "moon" (natural satellites of other planets are also called moons). Its symbol is a crescent (Unicode: ☾). The terms lunar, selene/seleno-, and cynthion (from the Lunar deities Selene and Cynthia) refer to the Moon (apo ...

Including:

Moon - The two sides Moon - Orbit Moon - Earth & Moon Moon - Origin and history Moon - Physical characteristics
Moon - Composition Moon - Selenography Moon - Presence of water Moon - Magnetic field Moon - Atmosphere
Moon - Eclipses Moon - Occultation of stars Moon - Observation of the Moon Moon - Exploration of the Moon Moon - Human understanding of the Moon
Moon - Myth and folk culture Moon - The Moon as muse Moon - Astrology Moon - Scientific understanding Moon - Meteor impact on the Moon
Moon - Legal status Moon - Satellites Moon - Surface installations
Moon - Lunar location listings

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Some hoax advocates have proposed that the only convincing evidence that the landings did indeed occur would be in the form of observations of the landing sites. This would require the diversion of astronomical resources to a task of no scientific value. It is also unclear as to why this would be considered convincing evidence when other material items of evidence are not. So there is no reason to believe that hoax enthusiasts would be convinced by images taken of a landing site. At scope resolutions soon to be available, only outlines of la ...

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Apollo moon landing hoax accusations, Apollo moon landing hoax accusations - Conspiracy theory, Apollo moon landing hoax accusations - Motives, Apollo moon landing hoax accusations - Issues cited in accusations, Apollo moon landing hoax accusations - Issues of photographs, Apollo moon landing hoax accusations - Ionizing radiation and heat, Apollo moon landing hoax accusations - Transmission issues, Apollo moon landing hoax accusations - Mechanical issues, Apollo moon landing hoax accusations - Moon rocks, Apollo moon landing hoax accusations - People claimed to be included in the hoax, Apollo moon landing hoax accusations - Stanley Kubrick, Apollo moon landing hoax accusations - Deaths of key people involved with the Apollo program, Apollo moon landing hoax accusations - Observing the landing sites, Apollo moon landing hoax accusations - NASA's rebuttal cancelled, Apollo moon landing hoax accusations - Flat Earth Society, Apollo moon landing hoax accusations - Pop culture

Read more here: » Apollo moon landing hoax accusations: Encyclopedia II - Apollo moon landing hoax accusations - Observing the landing sites

Proponents of the Apollo moon landing hoax accusations allege that the Apollo Moon Landings never took place, and were faked by NASA with possible CIA support. According to a 1999 Gallup poll, about 6 percent of the population of the U.S. has doubts that the Apollo astronauts walked on the moon. "Although, if taken literally, 6 percent translates into millions of individuals," Gallup said of this, "it is not unusual to find about that many people in the typical poll agreeing with almost any question that is asked of them -- so the best inter ...

Including:

Apollo moon landing hoax accusations - Conspiracy theory Apollo moon landing hoax accusations - Motives Apollo moon landing hoax accusations - Issues cited in accusations
Apollo moon landing hoax accusations - Issues of photographs Apollo moon landing hoax accusations - Ionizing radiation and heat Apollo moon landing hoax accusations - Transmission issues Apollo moon landing hoax accusations - Mechanical issues Apollo moon landing hoax accusations - Moon rocks
Apollo moon landing hoax accusations - People claimed to be included in the hoax
Apollo moon landing hoax accusations - Stanley Kubrick Apollo moon landing hoax accusations - Deaths of key people involved with the Apollo program
Apollo moon landing hoax accusations - Observing the landing sites Apollo moon landing hoax accusations - NASA's rebuttal cancelled Apollo moon landing hoax accusations - Flat Earth Society Apollo moon landing hoax accusations - Pop culture

Read more here: » Apollo moon landing hoax accusations: Encyclopedia - Apollo moon landing hoax accusations

A Cryovolcano is literally, an icy volcano. Cryovolcanoes form on icy moons, and possibly on other low temperature astronomical objects (e.g. Kuiper belt objects). Rather than molten rock, these volcanoes erupt volatiles such as water, ammonia or methane compounds. Collectively referred to as cryomagma, these substances are usually liquids and form flumes, but can also be in vapour form. After eruption cryomagma condenses to a solid form when exposed to the very low surrounding temperature. Cryovolcano - Theories< ...

Including:

Cryovolcano - Theories Cryovolcano - Observations
Cryovolcano - Cassini Mission

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Anton (or Antonius) Maria Schyrleus (also Schyrl, Schyrle) of Rheita (1597-1660) (in Czech, Antonín Maria Sírek z Reity) was a Czech astronomer and optician. He developed several inverting and erecting eyepieces, and was the maker of Kepler’s telescope. "Things appear more alive with the binocular telescope," he wrote, "doubly as exact so to speak, as well as large and b ...

Including:

Anton Maria Schyrleus of Rheita - Optics Anton Maria Schyrleus of Rheita - Astronomical observations Anton Maria Schyrleus of Rheita - The Moon Anton Maria Schyrleus of Rheita - Legacy

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Click image for description Venus, the second planet from the Sun, is named after the Roman goddess Venus. A terrestrial planet, it is sometimes called Earth's "sister planet", as the two are very similar in size and bulk composition. Although all planets' orbits are elliptical, Venus's orbit is the closest to circular, with an eccentricity of less than 1%. As Venus is closer to the Sun than the Earth, it always appears in roughly the same direction from Earth as the Sun (the greatest e ...

Including:

Venus - Physical characteristics
Venus - Atmosphere Venus - Surface features Venus - Venus' moon Venus - Aspects
Venus - Observations and explorations of Venus
Venus - Lowest distances to earth
Venus - Cultural references

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A solar eclipse occurs when the Moon passes in front of the Sun and obscures it totally or partially. This configuration can only occur at New Moon, when the Sun and Moon are in conjunction, as seen from the Earth. There are four types of solar eclipses: A total eclipse occurs when the Sun is completely obscured by the Moon. The intensely bright disk of the Sun is replaced by the dark outline of the Moon, and the much fainter corona is visible (see image right). During any one eclipse, a total eclipse is vis ...

Including:

Solar eclipse - Observing a solar eclipse
Solar eclipse - Viewing partial and annular eclipses Solar eclipse - Viewing totality during total eclipses Solar eclipse - Additional information
Solar eclipse - Eclipse Predictions
Solar eclipse - Geometry of an Eclipse Solar eclipse - Motion of the Moon and Earth Solar eclipse - Frequency of Solar Eclipses Solar eclipse - Path of an Eclipse Solar eclipse - Occurrence of Eclipses at a given place Solar eclipse - Eclipse Cycles
Solar eclipse - Historical solar eclipses Solar eclipse - Other Observations
Solar eclipse - Special observation campaigns Solar eclipse - Solar eclipse before sunrise or after sunset Solar eclipse - Simultaneous occurrence of solar eclipse and transit of a planet Solar eclipse - Solar eclipses by artificial satellites
Solar eclipse - Past and future eclipses

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Mars is the fourth planet from the Sun in our solar system. It is named after Mars, the Roman god of war (Ares in Greek mythology). Its name was chosen because of its red color, a feature that also earned it the nickname "The Red Planet". Mars has two moons, Phobos and Deimos, both are small and oddly-shaped, each possibly being captured asteroids. The prefix areo- refers to Mars in the same way geo- refers to Earth—for example, areology versus geology. (Areology is also used to refer to the study of Mars as a whole rather than ju ...

Including:

Mars - Mythology Mars - Physical characteristics
Mars - Atmosphere Mars - Geology Mars - Topography Mars - Canals Mars - Ice patches
Mars - The moons of Mars Mars - The exploration of Mars Mars - Nomenclature
Mars - Early nomenclature Mars - Modern nomenclature
Mars - Observation of Mars Mars - Appearance Mars - Martian meteorites Mars - Life on Mars Mars - The Mars flag Mars - Mars in fiction

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Gravity is a force of attraction that acts between bodies that have mass. It is a physical phenomenon of fundamental importance, profoundly affecting the workings of the world around us and the universe beyond. Most familiarly, it is the gravitational attraction of the earth that endows objects with weight and causes them to fall to the ground when dropped. In fact, gravity is also the reason for the very existence of the earth, the sun and other celestial bodies; without it matter would not have coalesced into these bodies and ...

Including:

Gravity - Overview of the history of gravitational theory Gravity - Newton's law of universal gravitation
Gravity - Acceleration due to gravity Gravity - Bodies with spatial extent Gravity - Vector form Gravity - Gravitational field
Gravity - The Earth's gravity
Gravity - Comparative gravities of the Earth Sun Moon and planets
Gravity - Mathematical equations for a falling body
Gravity - Gravitational potential Gravity - Acceleration relative to the rotating Earth
Gravity - Gravity and astronomy
Gravity - Self-gravitating system
Gravity - Practical uses of gravity Gravity - Problems with Newton's theory
Gravity - Theoretical concerns Gravity - Disagreement with observation Gravity - Newton's reservations
Gravity - Einstein's theory of gravitation
Gravity - Experimental tests
Gravity - Comparison with electromagnetic force Gravity - Gravity and quantum mechanics Gravity - Alternative theories
Gravity - Recent alternative theories Gravity - Historical alternative theories
Gravity - Notes

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Like the atmosphere of Titan, Triton's atmosphere is composed of nitrogen and methane. Nitrogen is also the principal constituent of Earth’s atmosphere, and the methane on Earth is normally associated with life, being a by-product of life. But like Titan, Triton is extremely cold, and if this wasn’t the case, methane would be a potential sign of life. In addition, Triton's atmosphere is almost non-existent (corresponding to a medium vacuum on Earth) a ...

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Triton moon, Triton moon - Name, Triton moon - Orbit, Triton moon - Physical characteristics, Triton moon - Seasons, Triton moon - Planetary geology, Triton moon - General Topography, Triton moon - “Cantaloupe terrain”, Triton moon - History of observation and exploration, Triton moon - Potential for life

Read more here: » Triton moon: Encyclopedia II - Triton moon - Potential for life

Triton is unique among all large moons in the solar system for its retrograde orbit around the planet (i.e., it orbits in a direction opposite to the planet's rotation). The small outer moons of Jupiter and Saturn also have retrograde orbits, as do three of Uranus' outer moons, but the largest of them (Phoebe) has only 8% of the diameter (and 0.03% of the mass) of Triton. Moons in retrograde orbits cannot form out of the same region of the solar nebula as the planets they orbit, but must be captured from elsewhere; it is thought that Triton ...

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Triton moon, Triton moon - Name, Triton moon - Orbit, Triton moon - Physical characteristics, Triton moon - Seasons, Triton moon - Planetary geology, Triton moon - General Topography, Triton moon - “Cantaloupe terrain”, Triton moon - History of observation and exploration, Triton moon - Potential for life

Read more here: » Triton moon: Encyclopedia II - Triton moon - Orbit

Triton has a similar size, density, and chemical composition to that of Pluto, and upon verifying the eccentric orbit of Pluto that crosses the orbit of Neptune, we can track the origin of Triton as a similar planet and was captured by Neptune. Therefore, Triton could have been formed far from Neptune in the frozen dark far reaches of the solar system. Even though there are various differences between Triton and other frozen moons of the solar system, the terrain is similar to Ariel (moon of Uranus), Enceladus (moon of Saturn). and three moons of Jupiter: Io, Europa, and Ganymede ...

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Triton moon, Triton moon - Name, Triton moon - Orbit, Triton moon - Physical characteristics, Triton moon - Seasons, Triton moon - Planetary geology, Triton moon - General Topography, Triton moon - “Cantaloupe terrain”, Triton moon - History of observation and exploration, Triton moon - Potential for life

Read more here: » Triton moon: Encyclopedia II - Triton moon - Planetary geology

Triton is named after Triton (from the Greek Τρίτων,son of Poseidon. The name was proposed by Camille Flammarion in 1880. It is perhaps strange that Lassell, the discoverer, did not see fit to name his own discovery, since he gave names a few years later to his subsequent discoveries of an eighth moon of Saturn (Hyperion), and of the third and fourth moons of Uranus (Ariel and Umbriel). After Flammarion's proposal, the name Triton was also independently proposed by others [2] [3] [4], but in 1909 it was reported as "not i ...

See also:

Triton moon, Triton moon - Name, Triton moon - Orbit, Triton moon - Physical characteristics, Triton moon - Seasons, Triton moon - Planetary geology, Triton moon - General Topography, Triton moon - “Cantaloupe terrain”, Triton moon - History of observation and exploration, Triton moon - Potential for life

Read more here: » Triton moon: Encyclopedia II - Triton moon - Name

The axis of rotation of Triton is highly irregular inclined 157 degrees in relation to the axis of Neptune, and 130 degrees in respect to the orbit of Neptune, putting one pole towards the sun every time. As Neptune orbits the sun, the polar region of Triton changes position every 82 years, which probably results in radical seasonal changes every time the pole moves towards the sun. Given its orbit and axial inclination, Triton shows change of seasons that is very extreme. The most extreme seasons occur in 700-year intervals and the nex ...

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Triton moon, Triton moon - Name, Triton moon - Orbit, Triton moon - Physical characteristics, Triton moon - Seasons, Triton moon - Planetary geology, Triton moon - General Topography, Triton moon - “Cantaloupe terrain”, Triton moon - History of observation and exploration, Triton moon - Potential for life

Read more here: » Triton moon: Encyclopedia II - Triton moon - Seasons

Apollo moon landing hoax accusations - Stanley Kubrick. It has been claimed, without any evidence, that in early 1968 (while 2001: A Space Odyssey, which includes scenes taking place on the Moon, was in post-production), NASA secretly approached Kubrick to direct the first three Moon landings. In this scenario the launch and splashdown would be real but the spacecraft would h ...

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Apollo moon landing hoax accusations, Apollo moon landing hoax accusations - Conspiracy theory, Apollo moon landing hoax accusations - Motives, Apollo moon landing hoax accusations - Issues cited in accusations, Apollo moon landing hoax accusations - Issues of photographs, Apollo moon landing hoax accusations - Ionizing radiation and heat, Apollo moon landing hoax accusations - Transmission issues, Apollo moon landing hoax accusations - Mechanical issues, Apollo moon landing hoax accusations - Moon rocks, Apollo moon landing hoax accusations - People claimed to be included in the hoax, Apollo moon landing hoax accusations - Stanley Kubrick, Apollo moon landing hoax accusations - Deaths of key people involved with the Apollo program, Apollo moon landing hoax accusations - Observing the landing sites, Apollo moon landing hoax accusations - NASA's rebuttal cancelled, Apollo moon landing hoax accusations - Flat Earth Society, Apollo moon landing hoax accusations - Pop culture

Read more here: » Apollo moon landing hoax accusations: Encyclopedia II - Apollo moon landing hoax accusations - People claimed to be included in the hoax

A brief treatment of some of the arguments and counter-arguments is given below. For more detail and discussion see the external links. Apollo moon landing hoax accusations - Issues of photographs. Believers in the hoax have alleged various issues with photographs claimed to have been taken on the Moon. Claims and rebuttals 1. Crosshairs on some photos appear to be behind objects, rather than in front of them where they should be, as if the photos were altered. < ...

See also:

Apollo moon landing hoax accusations, Apollo moon landing hoax accusations - Conspiracy theory, Apollo moon landing hoax accusations - Motives, Apollo moon landing hoax accusations - Issues cited in accusations, Apollo moon landing hoax accusations - Issues of photographs, Apollo moon landing hoax accusations - Ionizing radiation and heat, Apollo moon landing hoax accusations - Transmission issues, Apollo moon landing hoax accusations - Mechanical issues, Apollo moon landing hoax accusations - Moon rocks, Apollo moon landing hoax accusations - People claimed to be included in the hoax, Apollo moon landing hoax accusations - Stanley Kubrick, Apollo moon landing hoax accusations - Deaths of key people involved with the Apollo program, Apollo moon landing hoax accusations - Observing the landing sites, Apollo moon landing hoax accusations - NASA's rebuttal cancelled, Apollo moon landing hoax accusations - Flat Earth Society, Apollo moon landing hoax accusations - Pop culture

Read more here: » Apollo moon landing hoax accusations: Encyclopedia II - Apollo moon landing hoax accusations - Issues cited in accusations

Several motives have been suggested for the U.S. government to fake the moon landings - some of the recurrent elements are: Distraction - The U.S. government could have benefited from a popular distraction to take attention away from the Vietnam War. Conspiracy theorists note that lunar activities stopped abruptly, with planned missions cancelled, around the same time that the U.S. ceased its involvement in the Vietnam War. Cold War Prestige - The U.S. government considered it vital that the U.S. win the space race with ...

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Apollo moon landing hoax accusations, Apollo moon landing hoax accusations - Conspiracy theory, Apollo moon landing hoax accusations - Motives, Apollo moon landing hoax accusations - Issues cited in accusations, Apollo moon landing hoax accusations - Issues of photographs, Apollo moon landing hoax accusations - Ionizing radiation and heat, Apollo moon landing hoax accusations - Transmission issues, Apollo moon landing hoax accusations - Mechanical issues, Apollo moon landing hoax accusations - Moon rocks, Apollo moon landing hoax accusations - People claimed to be included in the hoax, Apollo moon landing hoax accusations - Stanley Kubrick, Apollo moon landing hoax accusations - Deaths of key people involved with the Apollo program, Apollo moon landing hoax accusations - Observing the landing sites, Apollo moon landing hoax accusations - NASA's rebuttal cancelled, Apollo moon landing hoax accusations - Flat Earth Society, Apollo moon landing hoax accusations - Pop culture

Read more here: » Apollo moon landing hoax accusations: Encyclopedia II - Apollo moon landing hoax accusations - Motives