Pluto is the ninth planet in the solar system. Discovered in 1930 and immediately classified as a planet, its status is currently under dispute. Pluto has an eccentric orbit that is highly inclined in respect to the other planets and takes it inside the orbit of Neptune. Its largest moon is Charon, discovered in 1978; two smaller moons were discovered in 2005. Pluto's astronomical symbol is a P-L monogram, ♇. This represents both the first two letters of the name Pluto and the initials of Percival Lowell ...

Including:

• Pluto - Discovery and naming
• Pluto - Orbit
• Pluto - Physical characteristics
• Pluto - Mass and size
• Pluto - Atmosphere
• Pluto - Appearance
• Pluto - Pluto's moons
• Pluto - Charon
• Pluto - The outer moons
• Pluto - Exploration of Pluto
• Pluto - The Pluto debate
• Pluto - Planet X?
• Pluto - Minor planet?
• Pluto - New discoveries
• Pluto - Pluto in popular culture

Read more here: » Pluto: Encyclopedia - Pluto

See also:

Pluto, Pluto - Discovery and naming, Pluto - Orbit, Pluto - Physical characteristics, Pluto - Mass and size, Pluto - Atmosphere, Pluto - Appearance, Pluto - Pluto's moons, Pluto - Charon, Pluto - The outer moons, Pluto - Exploration of Pluto, Pluto - The Pluto debate, Pluto - Planet X?, Pluto - Minor planet?, Pluto - New discoveries, Pluto - Pluto in popular culture

Read more here: » Pluto: Encyclopedia II - Pluto - Pluto's moons

More than 75 years after its discovery, many facts about Pluto remain unknown, mainly due to the fact that it is the only planet that has not been visited by human spacecraft and that it is too far away for in-depth investigations with telescopes from earth. What is known are the few physical properties listed below. Pluto - Mass and size. Pluto is not only smaller and much less massive than every other planet, but at less than 0.2 lunar masses it is also smaller and less massive than seven moons: Ganymede ...

See also:

Pluto, Pluto - Discovery and naming, Pluto - Orbit, Pluto - Physical characteristics, Pluto - Mass and size, Pluto - Atmosphere, Pluto - Appearance, Pluto - Pluto's moons, Pluto - Charon, Pluto - The outer moons, Pluto - Exploration of Pluto, Pluto - The Pluto debate, Pluto - Planet X?, Pluto - Minor planet?, Pluto - New discoveries, Pluto - Pluto in popular culture

Read more here: » Pluto: Encyclopedia II - Pluto - Physical characteristics

90377 Sedna is a trans-Neptunian object, discovered by Michael Brown (Caltech), Chad Trujillo (Gemini Observatory) and David Rabinowitz (Yale University) on November 14, 2003. Its discovery was the farthest distance at which any natural object in the solar system has ever been observed. Sedna is described as a cold planetoid, perhaps as large as two-thirds the size of Pluto. 90377 Sedna - General information. Sedna was discovered during a survey conducted with the Samuel Oschin telescope at Palomar Observat ...

Including:

• 90377 Sedna - General information
• 90377 Sedna - Orbital characteristics
• 90377 Sedna - Physical characteristics
• 90377 Sedna - Classification

Read more here: » 90377 Sedna: Encyclopedia - 90377 Sedna

Charon (shar'-ən or karr'-ən, Greek Χάρων) is the largest satellite of Pluto. It was discovered by astronomer James Christy on June 22, 1978 by carefully examining highly magnified images of Pluto on photographic plates taken a couple of months before and noticing that a slight bulge appeared periodically. Later, the bulge was confirmed on plates dating back to April 29, 1965. It received the temporary designation S/1978 P 1, according to the then-recently instituted convention. It is not to be confu ...

Read more here: » Charon moon: Encyclopedia - Charon moon

Click image for description Neptune is the eighth or, occasionally, the ninth planet from the Sun due to Pluto's eccentric orbit (if Pluto counts as a planet), and the outermost gas giant in our solar system. Although the smallest of the gas giants, Neptune is more massive than Uranus: Its stronger gravitational field has compressed it to a higher density. Faint dark rings have been detected around the blue planet, but are less substantial than those of Saturn. When these ...

Including:

• Neptune - Discovery
• Neptune - Naming
• Neptune - Physical characteristics
• Neptune - Planetary rings
• Neptune - Natural satellites and Trojan asteroids
• Neptune - Appearance and visibility from Earth
• Neptune - Occultation of stars by Neptune between 1800 and 2100
• Neptune - Neptune in fiction and film
• Neptune - Notes

Read more here: » Neptune: Encyclopedia - Neptune

2003 UB313 (center) and moon (right of center). Keck Observatory. 2003 UB313 is a trans-Neptunian object (TNO) which California astronomers at Mount Palomar observatory describe as "definitely bigger" than the planet Pluto. The object has already been dubbed the tenth planet by the discoverers, NASA, and some media outlets, but it is not yet clear whether it will be widely accepted as a new planet or not. It has at least one moon. No official name for ...

Including:

• 2003 UB313 - Discovery
• 2003 UB313 - Classification
• 2003 UB313 - Name
• 2003 UB313 - Orbit
• 2003 UB313 - Size
• 2003 UB313 - Surface
• 2003 UB313 - Moon

Read more here: » 2003 UB313: Encyclopedia - 2003 UB313

Clyde William Tombaugh (February 4, 1906 — January 17, 1997) was an American astronomer who discovered the planet Pluto in 1930. Tombaugh was born in Streator, La Salle County, Illinois. After his family moved to Burdett, Kansas, Tombaugh built his first telescope and sent drawings of his observations of Jupiter and Mars to the Lowell Observatory. These resulted in a job offer. Tombaugh was employed at the Lowell Observatory from 1929 to 1945. Following his discovery of Pluto, Tombaugh earned astronomy degrees from the University of Kansas and Northern Arizona University. He taught astronomy at New Me ...

Including:

• Clyde Tombaugh - Discovery of Pluto
• Clyde Tombaugh - Asteroids discovered
• Clyde Tombaugh - Interest in UFOs
• Clyde Tombaugh - Near-Earth satellite search
• Clyde Tombaugh - Sources

Read more here: » Clyde Tombaugh: Encyclopedia - Clyde Tombaugh

Cillian Murphy (born May 25, 1976 in Douglas, Cork, Ireland) is an Irish actor and musician. Cillian is an Irish name and is also sometimes incorrectly spelled Killian; both spellings are pronounced /ˈkɪliən/. Cillian Murphy - Early life. Murphy attended the Presentation Brothers College in Cork, and later studied law at University College Cork (UCC). Initially his interest in performing was led by music. He played guitar with a Frank Za ...

Including:

• Cillian Murphy - Early life
• Cillian Murphy - Career
• Cillian Murphy - Personal life
• Cillian Murphy - Filmography

Read more here: » Cillian Murphy: Encyclopedia - Cillian Murphy

Sanchuniathon or Sanchoniathon or Sanchoniatho is the purported Phoenician author of three lost works originally in Phoenician, surviving only in partial paraphrase and summary of a Greek translation by Philo of Byblos, according to the Christian bishop Eusebius of Caesarea. These few fragments comprise the most extended literary source concerning Phoenician religion in either Greek or Latin. Sanchuniathon - The author. The compilers of the 1911 Encyclopædia Britannica warned that Sanc ...

Including:

• Sanchuniathon - The author
• Sanchuniathon - The Work
• Sanchuniathon - Philosphical Creation Story
• Sanchuniathon - Allegorical culture heroes
• Sanchuniathon - The history of the gods
• Sanchuniathon - About Serpents

Read more here: » Sanchuniathon: Encyclopedia - Sanchuniathon

The solar system comprises our Sun and the retinue of celestial objects gravitationally bound to it. Traditionally, this is said to consist of the Sun, nine planets and their 158 currently known moons; however, a large number of other objects, including asteroids, meteoroids, planetoids, comets, and interplanetary dust, orbit the Sun as well. Although the term "solar system" is frequently applied to other star systems and the planetary systems which may comprise them, it should strictly refer to our system specifically: the wor ...

Including:

• Solar system - Structure and layout of the solar system
• Solar system - Origin and age of the solar system
• Solar system - Regions of the solar system
• Solar system - Interplanetary medium
• Solar system - The inner planets
• Solar system - The asteroid belt
• Solar system - The outer planets
• Solar system - The trans-Neptunian region
• Solar system - And beyond
• Solar system - Galactic orbit of the solar system
• Solar system - Planetary system formation
• Solar system - Discovery of the solar system
• Solar system - Exploration of the solar system
• Solar system - Attributes of major planets
• Solar system - Attributes of the largest minor planets
• Solar system - Other facts

Read more here: » Solar system: Encyclopedia - Solar system

In Greek mythology, Persephone (Greek Περσεφόνη, Classical Greek Persephónē, Modern Greek Persefóni) was the queen of the Underworld, the Kore or young maiden, and the daughter of Demeter. Persephone ("she who destroys the light") is her name in the Ionic Greek of epic literature. In other dialects she was known under various other names: Persephassa, Persephatta, or simply Kore. The Romans first heard of her from the Aeolian and Dorian cities of Magna Graecia, ...

Including:

• Persephone - Overview
• Persephone - The Abduction Myth
• Persephone - Modern Scholarship on Persephone
• Persephone - Persephone Before the Greeks?
• Persephone - Life-Death-Rebirth
• Persephone - Consorts/Children
• Persephone - The 1911 Britannica's account of the myth

Read more here: » Persephone: Encyclopedia - Persephone

Had and Hadit both refer to the Thelemic version of an Egyptian god. The earlier, Egyptian version, went by the name of Hor-Behudeti or Horus of Edfu. Thoth let him take the form of the solar disk to help a younger version of Horus -- Re-Horakhty, or Ra-Hoor-Khuit -- in a battle with Set and his army. Both versions of Horus appear in the Egyptian image that Thelemites call Stele 666 (of the Boulaq ...

Read more here: » Hadit: Encyclopedia - Hadit

Zeta Aquarii (ζ Aqr / ζ Aquarii) is a binary star,the central star in the “water jar” asterism (Click here to see the "water jar") in the constellation Aquarius. It is approximately 103 light years from Earth. The brighter component, ζ² Aquarii, is a yellow-white F-type main sequence dwarf with an apparent magnitude of +4.42. Its companion, ζ¹ Aquarii, is a yellow-white F-type subgiant with an apparent magnitude of +4.59. The fact that their brightness is so close makes the pair easy to measure and resol ...

Including:

• Zeta Aquarii - References:

Read more here: » Zeta Aquarii: Encyclopedia - Zeta Aquarii

Prograde motion is the rotational or orbital motion of a body in a direction similar to that of other bodies within a given system, and is sometimes called direct motion. Retrograde motion is in the contrary direction. The word 'retrograde' derives from the Latin words retro, backwards, and gradus, step. Prograde and retrograde motion - Two notations. The north orbital pole of a celestial body is defined by the right-hand rule: If you curve the fingers of your right hand a ...

Including:

• Prograde and retrograde motion - Two notations
• Prograde and retrograde motion - Retrograde orbits
• Prograde and retrograde motion - Retrograde rotation
• Prograde and retrograde motion - Retrogradation or apparent retrograde motion
• Prograde and retrograde motion - Examples
• Prograde and retrograde motion - Reference

Read more here: » Prograde and retrograde motion: Encyclopedia - Prograde and retrograde motion

Sedna has an estimated diameter of between 1180 and 1800 kilometres (730 to 1120 miles). At the time of its discovery it was the largest object found in the solar system since Pluto was discovered in 1930. It is now generally believed to be the 5th largest known trans-Neptunian object after 2003 UB313, Pluto, 2005 FY9, and 2003 EL61. The planetoid is so far from the Sun that the temperatur ...

See also:

90377 Sedna, 90377 Sedna - General information, 90377 Sedna - Orbital characteristics, 90377 Sedna - Physical characteristics, 90377 Sedna - Classification

Read more here: » 90377 Sedna: Encyclopedia II - 90377 Sedna - Physical characteristics

Sedna has an estimated diameter of between 1180 and 1800 kilometres (730 to 1120 miles). At the time of its discovery it was the largest object found in the solar system since Pluto was discovered in 1930. It is now generally believed to be the 4th largest known trans-Neptunian object after 2003 UB313, Pluto, and 2005 FY9. The planetoid is so far from the Sun that the temperatur ...

See also:

90377 Sedna, 90377 Sedna - General information, 90377 Sedna - Orbital characteristics, 90377 Sedna - Physical characteristics, 90377 Sedna - Classification

Read more here: » 90377 Sedna: Encyclopedia II - 90377 Sedna - Physical characteristics

While a young researcher working for Lowell Observatory in Flagstaff, Arizona, Tombaugh found Pluto during a systematic search for a trans-Neptunian planet (also called Planet X), which had been predicted by Percival Lowell and William Pickering. Tombaugh's discovery involved painstaking use of a blink comparator to compare photographs of sections of sky taken several nights apart. Comparing the two images, a moving object such as a planet would appear to jump from one position to another, while the more distant objects such as stars ...

See also:

Clyde Tombaugh, Clyde Tombaugh - Discovery of Pluto, Clyde Tombaugh - Asteroids discovered, Clyde Tombaugh - Interest in UFOs, Clyde Tombaugh - Near-Earth satellite search, Clyde Tombaugh - Sources

Read more here: » Clyde Tombaugh: Encyclopedia II - Clyde Tombaugh - Discovery of Pluto

In The Picnic (November 14, 1930) , Minnie introduces her boyfriend to her new pet dog Rover. This is actually Pluto making his first appearance as an individual character. Two unnamed bloodhound guard dogs strikingly similar to him had previously appeared in The Chain Gang (August 18, 1930) which featured Mickey incarcerated in prison without Minnie at his side. Otherwise the short features a typical picnic excursion harassed by forest an ...

See also:

Minnie Mouse, Minnie Mouse - Origins of the character, Minnie Mouse - A recurring co-star, Minnie Mouse - Minnie's Yoo Hoo, Minnie Mouse - Damsel in distress, Minnie Mouse - Introduction of a pet, Minnie Mouse - Contemporary appearances, Minnie Mouse - Voice Actors, Minnie Mouse - Trivia

Read more here: » Minnie Mouse: Encyclopedia II - Minnie Mouse - Introduction of a pet

Retrograde motion should not be confused with retrogradation. The latter term is used in reference to the motion of the outer planets (Mars, Jupiter, Saturn, Neptune, Uranus, and Pluto). Though these planets appear to move from east to west on a nightly basis in response to the spin of Earth, they are most of the time drifting slowly eastward with respect to the background of stars, which can be observed by noting the position of these planets for several nights in a row. This motion is normal for these planets, so it is called dir ...

See also:

Prograde and retrograde motion, Prograde and retrograde motion - Two notations, Prograde and retrograde motion - Retrograde orbits, Prograde and retrograde motion - Retrograde rotation, Prograde and retrograde motion - Retrogradation, or apparent retrograde motion, Prograde and retrograde motion - Examples, Prograde and retrograde motion - Reference

Read more here: » Prograde and retrograde motion: Encyclopedia II - Prograde and retrograde motion - Retrogradation, or apparent retrograde motion