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- Solar system (21174 bytes)
7: *The [[Sun]] (☉) is a [[Stellar_classification|spectral class]] G2 [[star]] that contains ...
20: ... System, accompanied by their main satellites, profiled against the limb of the Sun]]
23: *Artificial [[satellite]]s orbiting the planets, mainly E...
25: **[[Space debris]] of artificial origin that can be found in orbit around Eart...
26: ...are sub-planetary bodies that accreted during the first years of the Solar System and that no longer e... - Sun (20830 bytes)
39: | [[1 E18 m²|6.09]] [[scientific notation|×]] 10<sup>12</sup> [[square kilo...
128: ... a [[main sequence]] star, with a [[Stellar_classification|spectral class]] of G2, meaning that it is ...
136: ...tor). Tidal effects from the planets do not significantly affect the shape of the Sun, although the S...
138: ...ntre of the Sun. Nevertheless, the Sun has well defined interior structure, described below. The Sun'...
144: ... of 4.26 million tonnes per second or 383 [[SI prefix|yottawatts]] (9.15×10<sup>16</sup> tons of... - Planetary system (2476 bytes)
7: ...companions were almost entirely evaporated by the supernova blast, leaving behind planet-sized bodies. Alter...
9: == Significant planetary systems ==
10: ...ystem, the first planetary system discovered, the first multiplanet planetary system discovered
11: ..., the first multi exoplanet system discoverd, the first multi planet system with a pulsar discovered
12: * [[Upsilon Andromedae]] - the first multiplanet extrasolar planetary system discov... - Planet (8450 bytes)
1: ...cts in orbit around other stars, the problem of defining a planet has become rather more acute.
17: ...(♃) - [[Jupiter's natural satellites|63 confirmed natural satellites]]
18: ... (♄) - [[Saturn's natural satellites|46 confirmed satellites]]
21: ...47;) (many astronomers contend it should be classified as a [[Kuiper belt|Kuiper belt object]] and not...
24: ===Classification=== - History of science (41710 bytes)
2: ...estigating the [[universe]] known as the [[scientific method]]. The '''history of science''' traces th...
4: ...al that older inquiries are known as ''pre-scientific''. Still, many place ancient [[natural philosoph...
6: ...e, notably [[ethics]]. In practice, each of these fields is heavily used by the others as an external ...
11: ...owledge, and to de-emphasize the view that scientific data is self-evident, value-free, and context-fr...
13: ...; and [[Paul Feyerabend]], who argued that scientific knowledge is not cumulative or progressive, and ... - Johannes Kepler (17038 bytes)
2: ...arl Sagan]] also refers to him as the last scientific [[astrologer]].
15: ... of the T?n faculty. However, before he took his final exams he was recommended for the vacant post o...
21: In October [[1604]], Kepler observed the [[supernova]] which was subsequently named [[Kepler's Star]]....
23: ...ograph on the origins of [[snow|snowflakes]], the first known work on the subject. He correctly theori...
25: ...ed. He initially rejected this idea, but later confirmed it on [[May 15]] of the same year. - Tycho Brahe (17516 bytes)
8: ... Tycho's father, a [[nobleman]], was an important figure in the [[Denmark|Danish]] King's court. [[Bea...
33: ...new" star. (We now know that Tycho's star was a [[supernova]].) This discovery was decisive for his choice of...
38: ...m]], for the same reasons that he argued that the supernova of 1572 was not near the Earth. He argued that if...
43: ...rway]], impressed with Tycho's 1572 observations, financed the construction of two observatories for T...
47: ...vents such as the [[comet]] of [[1577]] and the [[supernova]] of [[1572]]. - Hubble Space Telescope (50930 bytes)
38: |'''[[WFPC2]]'''||wide field camera
47: The future of Hubble is currently uncertain. Its final servicing mission was cancelled following the ...
54: ...ervatory would have over ground-based telescopes: first, the [[angular resolution]] (smallest separati...
56: ...a committee given the task of defining the scientific objectives for a large space telescope.
58: ...ce program, and 1966 saw [[NASA]]'s launch of the first [[Orbiting Astronomical Observatory]] (OAO) mi... - Californium (7452 bytes)
25: <td>[[Electron configuration]] </td><td><nowiki>...
38: .../td><td>[[1 E7 s|333.5 d]] </td><td>[[spontaneous fission|SF]]<br>[[alpha emission|α]]</td><td><...
59: ...ay have been detected through [[telescope]]s in [[supernova]]e remnants. Californium-249 is formed from the ...
61: ...gely too difficult to produce to have useful significance as a material. Two of its few uses;
62: ...utron moisture gauges]] which are in turn used to find [[water]] and [[petroleum]] layers in [[oil wel... - Iron (23778 bytes)
40: <td>[[Electron configuration]] </td><td><nowiki>...
55: ... </td><td>7.09 [[scientific notation|×]]10<sup>-6</sup> [[cubic metre ...
69: <td>[[Specific heat capacity]] </td><td>....
135: ...ntribute to its [[Earth's magnetic field|magnetic field]]. Its symbol ''Fe'' is an abbreviation of ''...
139: ...er produce sufficient energy in its core, and a [[supernova]] will ensue. - Manganese (14965 bytes)
34: <td>[[Electron configuration]] </td><td><nowiki>...
49: ... </td><td>7.35 [[scientific notation|×]]10<sup>-6</sup> [[cubic metre ...
63: <td>[[Specific heat capacity]] </td><td>4...
106: ...a hard metal and is very brittle, fusible with difficulty, but easily oxidized. Manganese metal is fer...
112: ...iron and steel production by virtue of its sulfur-fixing, deoxidizing, and alloying properties. [[Stee... - Nickel (13955 bytes)
44: |[[Electron configuration]]
68: |6.59 [[scientific notation|×]]10<sup>-6</sup> [[cubic metre ...
87: |[[Specific heat capacity]]
173: Nickel is one of the five [[ferromagnetic]] elements. Because of the pre...
184: ... permeability]], and is used to screen [[magnetic field]]s. - History of science in early cultures (11033 bytes)
3: ...communicated across generations with much greater fidelity. Combined with the [[Origins of agriculture...
6: ...|200px|[[Mesopotamian]] clay tablet [[492 BC]], [[Field Museum of Natural History]],[[Chicago]]. ([[Pa...
9: ...ennia before Pythagoras{{fn|1}}, [http://www.angelfire.com/nt/Gilgamesh/achieve.html] but an abstract ...
11: ...late the [[precession]] of the [[Earth]]'s axis. Fifteen hundred years after Kiddinu, [[Al-Batani]], ...
16: ...a treatise from the [[6th century]], a summary of five astronomical systems can be found. - Star (12279 bytes)
11: ...Eddington limit]] is part of the answer. The very first stars to form after the Big Bang may have been...
13: ...ies are [[brown dwarf]]s, which occupy a poorly-defined grey area between stars and [[gas giant]]s. Th...
15: Scientifically, stars are defined as [[Gravity#Self-gravitating_system|self-grav...
25: ...nside those clouds triggered by shockwaves from [[supernova]]e. High mass stars powerfully illuminate the clo...
36: ...s that happens on human timescales; historically, supernovae have been observed as "new stars" where none exi... - Taurus (constellation) (2696 bytes)
5: One of the few [[apparent magnitude|first magnitude]] stars in the sky, the bright red [...
13: ... the [[Crab Nebula]] ([[Messier object|M1]]), a [[supernova]] remnant northeast of Zeta. The explosion, seen ...
22: ...(with Virgo and Capricorn). It is one of the four Fixed signs (along with [[Leo]], [[Scorpio]], and [[... - Walter Baade (2275 bytes)
19: | [[5656 Oldfield]] || [[October 8]], [[1920]]
26: Along with [[Fritz Zwicky]], he proposed that [[supernova]]e could create [[neutron star]]s.
28: ...a galaxy]] for the first time, which led him to define distinct "[[stellar population|populations]]" f...
30: ... of the supernova of the year [[1054]], and identified the optical counterparts of various [[radio ast...
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