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- Asteroid (24334 bytes)
1: ...emnants of the [[protoplanetary disc]] which were not incorporated into planets during the system's fo...
4: ... by [[Georg Adolph Erman|Erman]]<!--- (1806-1877) not to be confused with Adolf Erman (1854-1937), the...
6: ...the solar system, and some argue that not every minor planet should be called an "asteroid".
8: ... distinction is made because asteroids are large enough to survive passage through [[Earth's atmospher...
10: ...cts in our system, and [[minor planet]] for a taxonomy of the subplanetary objects that include astero... - Mercury (planet) (22924 bytes)
1: ...he greatest [[elongation]] is 28.3?). Mercury has no [[natural satellite]]s. The only [[spacecraft]] t...
3: ...lled [[Hermes]] when in the evening sky, but was known as [[Apollo]] when it appeared in the morning, ...
10: ...t 11 K (with respect only to [[solar radiation]]; not [[climate]] or [[season]]). The sunlight on Merc...
12: ...[freezing|frozen]] [[water]] [[ice]] at Mercury's north pole. Such ice is believed to exist at the bot...
20: * [[Albedo]] features (areas of markedly different reflectiv... - Cloud (9947 bytes)
3: ...'s atmosphere|atmosphere]] above [[Earth]]'s (or another [[planetary body]]'s) surface.
5: ...ck if they are so thick or dense that sunlight cannot pass through.
18: ...suspended. As well, conditions inside a cloud are not static: water droplets are constantly forming an...
22: ... and larger droplets, which are eventually heavy enough to overcome air currents in the cloud and the ...
28: .... Clouds are classified by the cloud base height, not the cloud top. This system was proposed by [[Lu... - Venus (planet) (31010 bytes)
5: ...ndar based on Venus's motion) and must have been known long before in prehistoric times, given that it...
7: ...ith [[sexually transmitted disease]]s. Some astronomers use ''[[Cytherean]]'', which comes from [[Cyt...
14: ...ion of its dense atmosphere, the temperature does not vary significantly between the night and day sid...
16: ...er to the Sun than Earth, the surface of Venus is not as well heated and even less well lit by the Sun...
18: ...oud tops, but winds at the surface are very slow, no more than a few kilometres per hour. However, owi... - Mars (27704 bytes)
2: ...Image:Mars NPArea-PIA00161 modest.jpg|thumb|right|North Polar region with icecap. (Courtesy NASA/JPL-C...
13: ...niformly distributed in the atmosphere. Plans are now being made to look for other 'companion' gases t...
24: ...], this interpretation remains controversial with no consensus having emerged.
27: ...divided into two kinds of areas, with differing [[albedo]]. The paler plains covered with dust and sand ri...
29: ...called [[Tharsis]], containing several large volcanos. See [[list of mountains on Mars]]. Mars also h... - Jupiter (24639 bytes)
6: ...="2" | [[Orbit]]al characteristics ([[Epoch (astronomy)|Epoch]] J2000)
9: ...412,027]] [[kilometre|km]]<br>5.203 363 01 [[Astronomical unit|AU]]
26: ! align="left" | [[Synodic period]]
41: ...the ascending node|Longitude of the<br> ascending node]]
88: ! align="left" | [[Right ascension]]<br>of North pole - Saturn (planet) (23300 bytes)
6: ...="2" | [[Orbit]]al characteristics ([[Epoch (astronomy)|Epoch]] [[J2000]])
9: ...725,413]] [[kilometre|km]]<br>9.537 070 32 [[Astronomical unit|AU]]
26: ! align="left" | [[Synodic period]]
41: ...the ascending node|Longitude of the<br> ascending node]]
88: ! align="left"| [[Right ascension]]<br>of North pole - Uranus (15207 bytes)
15: ...n="2"| [[Orbit]]al characteristics ([[Epoch (astronomy)|Epoch]] [[J2000]])
18: ...,972,220 [[kilometre|km]]<br>19.191 263 93 [[Astronomical unit|AU]]
35: !align="left"| [[Synodic period]]
50: ...the ascending node|Longitude of the<br> ascending node]]
97: !align="left"| [[Right ascension]]<br>of North pole<!--- Pole of direct rotation ---> - Neptune (planet) (18545 bytes)
14: ...="2" | [[Orbit]]al characteristics ([[Epoch (astronomy)|Epoch]] [[J2000]])
17: ...52,900]] [[kilometre|km]]<br>30.068 963 48 [[Astronomical unit|AU]]
34: ! align="left" | [[Synodic period]]
49: ...the ascending node|Longitude of the<br> ascending node]]
96: ! align="left" | [[Right ascension]]<br>of North pole - Pluto (planet) (26470 bytes)
15: ...n="2"| [[Orbit]]al characteristics ([[Epoch (astronomy)|Epoch]] [[J2000]])
18: ...,376,272 [[kilometre|km]]<br>39.481 686 77 [[Astronomical unit|AU]]
35: !align="left"| [[Synodic period]]
50: ...the ascending node|Longitude of the<br> ascending node]]
71: | [[1 E22 kg|1.25]][[scientific notation|×]]10<sup>22</sup> [[kilogram|kg]]<br... - Ice age (15810 bytes)
4: ...lder periods with extensive ice sheets over the [[North America]]n and [[Europe]]an continents: in thi...
10: ...nt of the [[Switzerland|Swiss]] Grimsel glacier). No single person invented the idea [http://academic....
12: At this early stage of knowledge what were being studied were the glacial pe...
16: ...ugh this theory is recent and controversial. A minor ice age occurred from 460 to 430 million years a...
20: ...n years ago) with the spread of ice sheets in the Northern Hemisphere. Since then, the world has seen... - Climate change (15859 bytes)
3: ...21; for non-human caused change [http://www.grida.no/climate/ipcc_tar/wg1/518.htm]. Sometimes the term...
16: It is known that the weather is a chaotic non-linear [[dynamical system]].
17: It is not clear that the climate (the average of weather) ...
18: ...hat the climate system varies between chaotic and non-chaotic, depending on the state of the external ...
22: ...ears up to pre-industrial times [http://www.grida.no/climate/ipcc_tar/wg1/fig3-2.htm]. To see a graph ... - Moon (37975 bytes)
6: [[Image:Moon merged small.jpg|250px|none|The Moon as seen by an observer from Earth]]
12: | 384,400 [[kilometre|km]]<br />(0.0026 [[Astronomical unit|AU]])
29: ! align="left" | [[Synodic period]]
44: ...e ascending node|Longitude of the<br /> ascending node]]
65: | [[1 E13 m2|3.793]][[scientific notation|×]]10<sup>7</sup> [[square kilometre|... - Ice Age (15809 bytes)
3: ...lder periods with extensive ice sheets over the [[North America]]n and [[Europe]]an continents: in thi...
9: ...nt of the [[Switzerland|Swiss]] Grimsel glacier). No single person invented the idea [http://academic....
11: At this early stage of knowledge what were being studied were the glacial pe...
15: ...ugh this theory is recent and controversial. A minor ice age occurred from 460 to 430 million years a...
19: ...n years ago) with the spread of ice sheets in the Northern Hemisphere. Since then, the world has seen... - Wind power (27669 bytes)
11: ...imple. The earth is not heated evenly by the sun. Not only do the poles receive less energy from the s...
13: ...d night, the [[Coriolis effect]], the irregular [[albedo]] (reflectivity) of land and water, humidity, and...
28: ...ies, and an average value for a given location is not in itself a clear indication of the amount of en...
32: ...ts to fueled [[power plant]]s, it is important to note that 1000 kW of wind-turbine potential power wo...
36: ... accuracy limitations. Meterological wind data is not usually sufficient for accurate siting of a larg... - Arctic Ocean (7316 bytes)
2: ...O]] recognizes it as an ocean, [[oceanography|oceanographers]] may call it ''the Arctic Mediterranean ...
7: ...s surrounded by the land masses of [[Eurasia]], [[North America]], [[Greenland]], and a number of isla...
9: ... [http://www.marianatrench.com/mariana_trench-oceanography.htm].
11: [[Image:Polar bears near north pole.jpg|thumb|The Arctic Ocean is used by bot...
12: ...e shortest air route between the Pacific coast of North America and Europe overflies it. - Water (15217 bytes)
3: ... essential to all known forms of [[life]] and is known also as the most ''universal [[solvent]]''.
5: ...eorology)|precipitation]], and [[runoff (water)|runoff]] to the [[sea]].
7: ...]], and its availability is a major social and economic concern.
13: ..., water is continuously flowing from one form to another, in what is called the '''[[water cycle]]'''.
15: ...rising when seen for the first time: [[hail]], [[snow]], [[fog]] or [[dew]] for example. When appropr... - Contrail (4281 bytes)
6: ....jpg|thumb|right|250px|A [[satellite]] photo of [[Nova Scotia]] showing numerous contrails of jets tra...
26: ...tion of heat during the night by increasing the [[albedo]]. The suspension of air travel for 3 days in the...
29: ...ory]] alleging that some contrail-like clouds are not true contrails but are the result of high-altitu...
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