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- Solar system (21174 bytes)
5: ...s many of these categories have been found to be less clear-cut than once thought. This encyclopedia e...
8: ...[planet]]s of the Solar System are those nine bodies traditionally labelled as such:
18: ...|550px|This illustration shows the approximate sizes of the planets relative to one another and the Su...
20: ...e Solar System, accompanied by their main satellites, profiled against the limb of the Sun]]
22: *Sizeable objects that orbit these planets are [[Natural satellite|moon]]s. For a c... - Sun (20830 bytes)
11: ...×10<sup>6</sup> [[mile|mi]]) <br>(8.31 minutes at the [[Speed of Light]])
13: ...align="left" | [[Apparent magnitude|Visual brightness]] (''V'')
22: | 2.5×10<sup>17</sup> km <br>(26,000 [[light-year]]s)
25: | 2.26×10<sup>8</sup> [[Julian year|a]]
33: | [[1 E9 m|1.392]]×10<sup>6</sup> km<br>(109 [[Earth]]s) - Planetary system (2476 bytes)
5: ... low to make this a viable model. Accepted theories today argue that planetary systems form from a [[...
7: ... supernova blast, leaving behind planet-sized bodies. Alternatively, planets may somehow form in the ...
14: * [[55 Cancri]] - the largest extra solar planetary system discovered (4 plane...
15: ...r and the first discovered to be in an [[orbital resonance]] - Planet (8450 bytes)
1: ...r [[solar system]], although many astronomers contest that figure, with some saying it should be lower...
7: ...). The process of naming planets and their features is known as planetary nomenclature.
16: # [[Mars (planet)|Mars]] (♂) - 2 satellites ([[Deimos (moon)|Deimos]], [[Phobos (moon)|Phobos...
17: ...s natural satellites|63 confirmed natural satellites]]
18: ...[Saturn's natural satellites|46 confirmed satellites]] - History of science (41710 bytes)
2: ...c method]]. The '''history of science''' traces these [[phenomenon|phenomena]] and their pre-cursors b...
4: ...considered to be so fundamental that older inquiries are known as ''pre-scientific''. Still, many plac...
6: ...ledge, notably [[ethics]]. In practice, each of these fields is heavily used by the others as an exter...
8: ==Theories and sociology of the history of science==
9: {{seemain|Theories and sociology of the history of science}} - Johannes Kepler (17038 bytes)
2: ...y motion|laws of planetary motion]]. He is sometimes referred to as "the first [[theory|theoretical]] ...
4: Kepler was a [[professor]] of [[mathematics]] at the [[University of Gr...
6: ...er, since he wrote his ''magnum opus'' '''harmonices mundi''' ("The Harmony of the world") in Linz dur...
9: ...s said to have been a weak and sickly child, but despite his ill health, he was precociously brilliant...
15: ...f teacher of mathematics and astronomy at the Protestant school in Graz, Austria. He accepted the pos... - Tycho Brahe (17516 bytes)
3: ...aper mill]]. His best known assistant was [[Johannes Kepler]].
5: ... his surname "Brahe". Apparently his contemporaries did so and the usage has persisted.
8: ...itten Tÿcho). He was born at his family's ancestral seat of [[Knudstrup]] [[Castle]], [[Denmark]]...
10: ...tempt to get him back. Tycho lived with his childless uncle and aunt, J? Brahe and [[Inger Oxe]], in t...
12: ...ctatus de Sphaera, [[Apianus]]' Cosmographia seu descriptio totius orbis and [[Regiomontanus]]' De tri... - Hubble Space Telescope (50930 bytes)
2: ...| [[Image:Hst sts82.jpg|285px|The Hubble Space Telescope]]
4: ...maller; text-align:center;" | The Hubble Space Telescope, from the [[Space Shuttle Discovery]] during ...
6: ...rganization'''||[[NASA]], [[European Space Agency|ESA]]
24: |'''Telescope style'''||reflector
43: ...tronomy]]. Since its launch in 1990 it has been responsible for many ground-breaking observations and... - Californium (7452 bytes)
13: ...or="#ff99cc"><font color="black">'''Known properties'''</font></th></tr>
17: <td>[[Chemical series]] </td><td>[[Actinid...
31: ...#ff99cc"><font color="black">'''Most stable isotopes'''</font></th></tr>
48: ....285<br>6.124</td><td><sup>253</sup>[[Einsteinium|Es]]<br><sup>249</sup>Cm</td></tr>
54: ...transuranic element]], californium has very few uses and was discovered by bombarding [[curium]] with ... - Iron (23778 bytes)
5: <tr><td colspan="2" align="center">[[manganese]] – '''iron''' – [[cobalt]]</td>
19: <td>[[Chemical series]] </td><td>[[transit...
24: <td>[[Density]], [[Mohs hardness scale|Hardness]] </td>
30: ...lign="center" bgcolor="#ffc0c0">'''Atomic properties'''</th></tr>
48: ...gn="center" bgcolor="#ffc0c0">'''Physical properties'''</th></tr> - Manganese (14965 bytes)
5: ...="2" align="center">[[chromium]] – '''manganese''' – [[iron]]</td>
14: ...List of elements by number|Number]]</td><td>manganese, Mn, 25 </td></tr>
16: <td>[[Chemical series]] </td><td>[[transit...
20: <td>[[Density]], [[Mohs hardness scale|Hardness]] </td><td>7470 [[kilogram per cubic metre|kg...
24: ...lign="center" bgcolor="#ffc0c0">'''Atomic properties'''</th></tr> - Nickel (13955 bytes)
18: |[[Chemical series]]
24: |[[Density]], [[Mohs hardness scale|Hardness]]
30: ...lign="center" bgcolor="#ffc0c0"|'''Atomic properties'''
56: ...gn="center" bgcolor="#ffc0c0"|'''Physical properties'''
68: |6.59 [[scientific notation|×]]10<sup>-6</sup> [[cubic metre per mole|m³/... - History of science in early cultures (11033 bytes)
3: In prehistoric times, advice and knowledge was passed from generation ...
5: ==Mesopotamia==
6: ...ayTablet,palm-sized422BCE.jpg|left|thumb|200px|[[Mesopotamian]] clay tablet [[492 BC]], [[Field Museum...
7: ...eral) and http://www.stormpages.com/swadhwa/hofa/mesopotamia.html (astronomical)-->
9: ...goras{{fn|1}}, [http://www.angelfire.com/nt/Gilgamesh/achieve.html] but an abstract formulation of the... - Star (12279 bytes)
1: ...b|right|350px|The [[Pleiades (star cluster)|Pleiades]] star cluster]]
3: ...e the [[Sun]]. Unlike a [[planet]], a star generates energy through [[nuclear fusion]] and therefore e...
5: ...at the orbit speed of the [[Space Shuttle]] (5 miles per second -- almost 30,000 kilometers per hour),...
7: ...00 000 000 000 000 000 000, or 230 [[billion]] times as much as the 300 billion in our own [[Milky Way...
9: ...e Sun —about 1.6 [[terametre]]s. However, these have a much lower density than the Sun. - Taurus (constellation) (2696 bytes)
1: ...d [[Auriga (constellation)|Auriga]], to the southwest [[Orion (constellation)|Orion]], and to the sout...
3: ==Notable features==
5: ...lation. The horns of the bull stretch off to the west, marked by [[Elnath]] (Beta Tauri, traditionally...
9: ...e to the eye, the [[Pleiades (star cluster)|Pleiades]].
11: ...lie the [[Hyades (star cluster)|Hyades]], the nearest distinct open [[star cluster]], that with it for... - Walter Baade (2275 bytes)
3: | [[930 Westphalia]] || [[March 10]], [[1920]]
26: Along with [[Fritz Zwicky]], he proposed that [[supernova]]e could create [[neutron star]]s.
28: ... pollution]] at [[Mount Wilson Observatory]], to resolve stars in the center of the [[Andromeda galaxy...
30: ...erparts of various [[radio astronomy|radio]] sources.
34: ...in [[1955]], and the [[Henry Norris Russell Lectureship]] of the [[American Astronomical Society]] in ...
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