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- Age of the Earth (20052 bytes)
1: ...[Western Australia]] – and astronomers' and planetologists' estimates of the age of the [[solar ...
4: ...ntists such as [[Martin Luther]] and [[Johannes Kepler]] believed in a similar date, and some today co...
6: Few people had conceived the idea of a time that stretched ...
9: ...ew [[natural history|naturalists]] were trying to place the age of the Earth on a more scientific basi...
13: ... of the age of the Earth to creation tales, or simply assumed that the Earth always had been, always w... - Astronomy (13970 bytes)
1: ...[[science]] involving the [[observation]] and [[explanation]] of events occurring beyond the [[Earth]]...
5: ...onfused with [[astrology]], which assumes that people's destiny and human affairs in general are corre...
8: ...at they are rarely considered as independent disciplines anymore. Motions and positions of objects ar...
10: ...rned mainly with figuring out the observational implications of different models, and involves working...
12: ...n of space under study (e.g., Galactic astronomy, Planetary Sciences); by subject, such as star format... - Solar system (21174 bytes)
1: ...th]] is the third planet of the Solar System. ''[[Planetary system]]s'' are a more generic term for [[...
3: ==Planets In the Solar System==
5: ... clear-cut than once thought. This encyclopedia employs the following divisions:
8: *The [[planet]]s of the Solar System are those nine bodies ...
9: **[[Mercury (planet)|Mercury]] (☿) - Sun (20830 bytes)
76: ...ic]]) <br>67.23? <br>(to the [[Milky Way|galactic plane]])
122: ... as do innumerable other bodies including other [[planet]]s, [[asteroid]]s, [[meteoroid]]s, [[comet]]s...
124: ...bits is called ''its'' sun, and stars in a [[multiple star system]] are referred to as the "suns" of b...
128: ... [[light-year]]s from the [[galactic centre]], completing one revolution in about [[1 E15 s|226 Ma]] (...
136: ...un mostly because of the large mass of [[Jupiter (planet)|Jupiter]]. - Planetary system (2476 bytes)
1: ...ral satellite|moon]]s, and [[planet]]s). Our own planetary system which contains the [[Earth]] and [[...
3: == Origin and evolution of planetary systems ==
5: ... argue that planetary systems form from a [[solar nebula]].
7: ...aving behind planet-sized bodies. Alternatively, planets may somehow form in the [[accretion disk]] w...
9: == Significant planetary systems == - Comet (30542 bytes)
3: ... be many times more distant than [[Pluto (planet)|Pluto]]'s orbit. Often described as "dirty snowballs...
5: ... of the [[solar nebula]]; the outer edges of such nebulae are [[temperature|cool]] enough that [[water]] e...
15: ...the light that falls on it. It is thought that complex [[organic compound]]s are the dark surface mate...
21: ... star [[Nemesis (star)|Nemesis]]; or an unknown [[Planet X]].
23: ...being more than twice as massive as all the other planets combined. - Planet (8450 bytes)
1: ...bit around other stars, the problem of defining a planet has become rather more acute.
3: Planets are believed to form from a collapsing [[nebula]] that a star formed from, aggregating from gas a...
7: ... of naming planets and their features is known as planetary nomenclature.
9: ===Planets in the Solar System===
10: [[Image:Solare_Planeten99.jpg|framed|Planets in approx. scale of size, but not distance. ... - Mercury (planet) (22924 bytes)
1: ...74]]–[[1975|75]]); only 40–45% of the planet has been mapped.
3: ... [[caduceus]]. Before the [[5th century BC]], the planet Mercury actually had two names, as it was not...
5: The Chinese and Japanese cultures refer to the planet as the ''Water Star'', based on the [[Five El...
8: ...//www.answers.com/topic/mercury-in-roman-religion-planet-nearest-to-the-sun answers.com])
12: ...y [[comet]] impacts and/or gases arising from the planetary interior. - Jupiter (24639 bytes)
138: ...called Jove). The [[astronomical symbol]] for the planet is a stylized representation of the god's lig...
140: ...|Korean]], and [[Japan]]ese cultures refer to the planet as the ''Wood Star'', based on the [[Five Ele...
145: ...inition of what distinguishes a large and massive planet such as Jupiter from a [[brown dwarf]], altho...
147: ...at Red Spot]], a [[storm]] larger than Earth. The planet is perpetually covered with a layer of [[clou...
149: ...icus]]' heliocentric theory of the motions of the planets; Galileo's outspoken support of the Copernic... - Saturn (planet) (23300 bytes)
4: ...00" | [[Image:Saturn (planet) large.jpg|250px|The planet Saturn]]<br> <small><font color="white">Click...
137: ...t planet in the [[solar system]] after [[Jupiter (planet)|Jupiter]]. Saturn has large rings made main...
140: ...Saturn is also the only one of the Solar System's planets less dense than water, with an average speci...
142: ...plets of helium deep in Saturn's interior, the droplets of helium releasing heat by friction as they f...
144: ...turn has a warm polar [[vortex]], and is the only planet in the solar system known to do so. - Hubble Space Telescope (50930 bytes)
45: ...ission in 1993, the telescope was restored to its planned quality, and became a vital research tool as...
58: ...unch in 1968 until 1972, well beyond its original planned lifetime of one year.
60: ...y working life, and the concurrent development of plans for the re-usable [[Space Shuttle]] indicated ...
64: ... telescope, and forced cuts in the budget for the planning stages which at the time consisted of very ...
68: ... the [[European Space Agency]]. ESA agreed to supply some of the instruments for the telescope as wel... - History of astronomy (13532 bytes)
2: ...cts, especially [[star]]s and [[planet]]s. An example of this early astronomy might involve a study of...
4: ...ively fixed over the [[century|centuries]], while planets will move an appreciable amount during a com...
10: ...ral]] societies, in which the harvest depended on planting at the correct time of year. The most commo...
20: ...pin on its axis and considered the motions of the planets with respect to the sun.
24: ... (sphere) and ''Grahaganita'' (mathematics of the planets). - Magnesium (9193 bytes)
2: ...y weight (Gardner,2005), and it is the third most plentiful element dissolved in seawater. This [[alka...
11: * [[photoengraving|Photoengraved]] plates in the printing industry.
12: ...bined in alloys, this metal is essential for [[airplane]] and [[missile]] construction.
36: Organic magnesium is important in both [[plant]] and [[animal]] life. [[Chlorophyll]]s are ma...
42: ... five servings of fruits and vegetables daily and plenty of whole grains, helps to ensure an adequate ... - Xenon (12457 bytes)
184: == Applications ==
188: *In nuclear energy applications it is used in bubble chambers, probes, an...
192: ...t to [[space]], further decreasing the limited supply in the [[Earth]]'s [[atmosphere]].
203: ..., as well as [[sodium]] perxenate. The highly [[explosive]] compound xenon [[oxide|trioxide]] has also...
206: ...39, and therefore used as indicators of nuclear explosions. - History of science in early cultures (11033 bytes)
3: ...ment of]] [[agriculture]], which allowed for a surplus of food, it became possible for early [[Civiliz...
9: ...t Plimpton 232 records a number of Pythagorean triplets (3,4,5) (5,12,13). ..., dated 1900 BC, possibl...
11: ...ms of [[horoscope]]s and [[omen]]s, which might explain the popularity of the clay tablets. [[Hipparch...
38: ...Revolution]]. The philosophies of [[Socrates]], [[Plato]], and [[Aristotle]] being preeminent during t...
55: ...b|right|Messier Object 1, the Crab Nebula. In the nebula's very center lies a pulsar: a neutron star rotat... - Creation (theology) (32465 bytes)
5: ...ompatible with [[science]]. They may say, for example, that a certain [[scripture|scriptural]] account...
9: ...fic evidence|evidence]] from many scientific disciplines are the only [[empirical]] source for informa...
11: ... Earth|the geological history of Earth]], [[solar nebula|the formation of the solar system]], [[Big Bang|t...
19: ...d to actively interfere with its operation, or simply ceased to exist. Similarly, proponents of an alt...
23: ...l as, to a greater or lesser extent, scientific explanations of the origins and development of the [[u... - Star (12279 bytes)
1: ...g|thumb|right|350px|The [[Pleiades (star cluster)|Pleiades]] star cluster]]
3: ...in outer space, just like the [[Sun]]. Unlike a [[planet]], a star generates energy through [[nuclear ...
11: ...er, up to 300 solar masses or more, due to the complete absence of elements heavier than [[lithium]] i...
13: ...which has a mass only 93 times that of [[Jupiter (planet)|Jupiter]]. Smaller bodies are [[brown dwarf]...
15: ...ravitating_system|self-gravitating]] spheres of [[plasma]] in [[hydrostatic equilibrium]], which gener... - Ursa Major (6591 bytes)
3: ...erism]] known in the [[United Kingdom]] as the '''Plough''', and was formerly called by the old name '...
8: ...ional test of sight. Both stars are actually multiple in and of themselves, including the first [[tele...
24: ... 2.54 times and 0.76 times the mass of [[Jupiter (planet)|Jupiter]]. it is also known as the Vrihat Sa...
31: ...'s a not-too-well known fact that the Sun and its planets are located in a somewhat enriched region of...
33: ... into the general stream of stars in the galactic plane. The Sun, in its normal streaming orbit around... - Taurus (constellation) (2696 bytes)
9: ...visible to the eye, the [[Pleiades (star cluster)|Pleiades]].
13: ... a [[supernova]] remnant northeast of Zeta. The explosion, seen on Earth on [[July 4]], [[1054]], was ...
22: ...the [[domicile_(astrology)|domicile]] of [[Venus_(planet)|Venus]] and the [[exaltation_(astrology)|exa... - Aquarius (4770 bytes)
51: ...ta; Aquarii; and [[NGC 7293]], the famous [[Helix Nebula]], southwest of δ Aquarii.
66: ...has been considered Aquarius' ruling or co-ruling planet by many modern astrologers). Each astrologica...
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