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- Astronomy (13970 bytes)
1: '''Astronomy''' is the [[science]] involving the [[observation]] and [[explanation]] of even...
7: ==Divisions of astronomy==
8: ... motions of celestial bodies interacting under gravity, and [[solar system]] objects in particular. Mu...
15: ...arities to a terrestrial [[tornado]]). The dust devil itself (the black spot) is climbing the crater w...
50: ... and, in the near future, [[gravitational wave|gravitational waves]] (see [[LIGO]] and [[LISA (astrono... - Isaac Newton (23339 bytes)
2: ...niversal gravitation|universal gravitation]] and, via his [[Newton's laws of motion|laws of motion]], ...
4: ...[heliocentrism]]. Newton is also credited with providing mathematical substantiation for [[Kepler's la...
14: ... his mother went to live with her new husband, leaving her son in the care of his grandmother.
19: :Newton began his schooling in the village schools and was later sent to Grantham Gramm...
21: [[image:newton.jpg|thumb|left|Engraving after [[Enoch Seeman]]'s 1726 portrait of Newto... - Albert Einstein (43065 bytes)
3: ...n of the [[photoelectric effect]] and "for his services to Theoretical Physics".
5: After his [[general theory of relativity]] was formulated in [[November]] [[1915]], Eins...
7: ...the social impact of scientific discovery. An individual of monumental intellectual achievement, he re...
14: ...and, at the insistence of his mother, was given [[violin]] lessons.
16: ...r credited his development of the theory of relativity to this slowness, saying that by pondering spac... - Atom (12300 bytes)
14: | Smallest division of a [[chemical element]]
61: ...ical properties and exhibit the same chemical behavior. The various kinds of atoms are listed in the [...
70: ...n]]s, have the greatest influence on chemical behavior. Core electrons (those not in the outer shell)...
82: ...all" into the inner shell (with the emission of a photon that would carry away the difference in the energ...
84: ...rons in an atom's valence shell, the more [[reactivity|reactive]] it is. Group 1 metals are therefore ... - Hubble Space Telescope (50930 bytes)
4: ... [[Space Shuttle Discovery]] during the second servicing mission, [[STS-82]]
8: |'''Wavelength regime'''||optical, ultraviolet, near-infrared
45: ...was restored to its planned quality, and became a vital research tool as well as a [[public relations]...
47: ...e of Hubble is currently uncertain. Its final servicing mission was cancelled following the [[Space S...
54: ...d telescope could observe [[infrared]] and [[ultraviolet]] light, which are strongly absorbed by the a... - Ionosphere (19365 bytes)
8: ...ength]]s is considered to be ''ionizing'' since [[photon]]s of energy at these frequencies are capable of ...
10: ...s there is less received solar radiation. The activity of the sun is associated with the [[sunspot cyc...
14: ...during the day and night during minimum solar activity. With an active sun electron density values ar...
22: .../sub>). This layer can only reflect radio waves having frequencies less than 10 MHz. It has a negative...
28: ...n the presence of sunlight (during daytime), it divides into two layers, the F<sub>1</sub> and F<sub>2... - Hydrogen (20221 bytes)
47: ... </td><td>14.025 [[Kelvin|K]] (−434.452 ?[[Fahrenheit|F]])</td></tr>
67: <td>[[Electronegativity]] </td><td>2.2 ([[Pa...
69: ... </td><td>14304 [[joule per kilogram-kelvin|J/(kg*K)]]</td></tr>
71: <td>[[Electrical conductivity]] </td><td>__ 10<sup>6</su...
73: ... </td><td> 0.1815 [[watt per metre-kelvin|W/(m*K)]]</td></tr> - Electron (10516 bytes)
51: | [[Gravity]], [[Electromagnetic interaction|Electromagneti...
64: ===Properties and behavior of electrons===
66: ...metimes the term is used, as proposed by [[Carl David Anderson|Carl D. Anderson]], to refer to both ne...
68: ... the less accurately we can know its momentum and vice versa.
70: ...ir motion is coupled to nearby matter via lattice vibrations called phonons. When electrons move, free... - History of chemistry (8174 bytes)
3: ...pg|thumb|150px|left|Chemistry Clipart .Clipart provided by
6: ==The vitalism debate and organic chemistry==
8: ...[[oxygen]]) was settled, another dispute, about [[vitalism]] and the essential distinction between org...
12: ...zmann]] made great advances in explaining the behavior of [[gas]]es, this dispute was not finally sett...
23: ...ided a ready supply of products which not only provided energy, but also synthetic materials for cloth... - Matter (1902 bytes)
1: ...[fermion]]s. All [[gauge boson]]s (of which the [[photon]] is one), which mediate the [[four fundamental f...
10: *[[Particle physics]], which provides a bit of historical background - Color (30968 bytes)
3: ...g|300px|thumb|Color is an important part of the [[visual art]]s.]]
4: ...tinguish three differently filtered analyses of a view. The perception of color is influenced by lon...
8: The colors of the visible light spectrum.<br>
39: <tr><td>[[violet (color)|violet]]</td>
117: <td>Violet</td> - Solar cell (27643 bytes)
1: ...', or photovoltaic cell, is a [[semiconductor]] device consisting of a large-area [[p-n junction]] [[d...
15: ...62&RS=PN/2402662 US2402662], "''Light sensitive device''"). Sven Ason Berglund had a prior patent conc...
21: ...al for solar cells (and all other semiconductor devices) is crystalline [[silicon]]. Crystalline silic...
24: ...ically the least efficient, but there is a cost savings since there is very little silicon waste since...
27: ... and a laser scribe is then used to delineate individual cells. Two main thin film approaches are amor... - Electric field (1958 bytes)
1: ...agnetic field]], by a flow of energy, and by real photons.
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