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  1. Asteroid (24334 bytes)
    1: ...nd of the asteroid across the gouge on its underside and toward the opposite end. Features as small as...
    3: == Definition ==
    4: ...p://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1840AN.....17...81E&db_key=AST&high=41e14...
    6: The exact definition of an asteroid is unsettled. The term "mi...
    8: ...[boulder]]-sized or smaller. The distinction is made because asteroids are large enough to survive pas...
  2. Mercury (planet) (22924 bytes)
    1: ...anges from −0.4 to 5.5 in [[apparent magnitude]]; Mercury is sufficiently "close" to the Sun tha...
    3: ...not realized it could alternately appear on one side of the Sun and then the other. It was called [[He...
    12: ...aded [[Impact crater|crater]]s, where it has been deposited by [[comet]] impacts and/or gases arising ...
    16: ...idal bulge]]s, raised by the [[Sun]] (the Sun's tides on Mercury are about 17% stronger than the Moon'...
    20: * [[Albedo]] features (areas of markedly different reflectiv...
  3. Cloud (9947 bytes)
    3: ...ondensed [[water]] droplets or ice crystals suspended in the [[Earth's atmosphere|atmosphere]] above [...
    5: ...appear grey or even black if they are so thick or dense that sunlight cannot pass through.
    7: ...anets often consist of material other than water, depending on local atmospheric conditions (what gase...
    15: * where air flows up the side of a [[mountain]] and cools as it rises higher in...
    16: * when warm air blows over a colder surface such as a cool body of water.
  4. Venus (planet) (31010 bytes)
    1: ...]], is named after the [[Roman mythology|Roman goddess]] [[Venus (mythology)|Venus]]. A [[terrestrial...
    5: ...r: a circle with a small cross underneath ([[Unicode]]: ♀).
    7: ...m [[Cythera]]. Other less common adjectives include ''Venerean'' and ''Veneran''.
    14: ...ficantly between the night and day sides of Venus despite its extremely slow rotation (less than one r...
    16: ...quite similar to Earth. A common conceptual misunderstanding regarding Venus is the mistaken belief t...
  5. Mars (27704 bytes)
    2: [[Image:Mars NPArea-PIA00161 modest.jpg|thumb|right|North Polar region with icecap....
    4: ...]]s ([[Phobos (moon)|Phobos]] and [[Deimos (moon)|Deimos]]) which are both small and oddly-shaped, pos...
    8: ...e. Its red, fiery appearance is caused by Iron Oxide (rust) on its surface. Mars has only a quarter th...
    11: ...he atmosphere on Mars is 95 percent [[carbon dioxide]], 3 percent [[nitrogen]], 1.6 percent [[argon]],...
    13: ... volcanic methane is accompanied by [[sulfur dioxide]].
  6. Jupiter (24639 bytes)
    1: ...="margin: 0 0 1em 1em; border: 1px #aaa solid; border-collapse: collapse; font-size: 95%;" align="righ...
    4: ...]]<br/><small><font color="white">Click image for description</font></small>
    39: | 1.305 30&deg;<br>(6.09? to [[Sun]]'s equator)
    41: ...e ascending node|Longitude of the<br> ascending node]]
    42: | 100.556 15&deg;
  7. Saturn (planet) (23300 bytes)
    1: ...cing=0 align=right style="margin:0 0 .5em 1em; border-collapse:collapse;" width=280px;
    4: ...]]<br> <small><font color="white">Click image for description</font></small>
    39: | 2.484 46&deg;<br>(5.51? to Sun's equator)
    41: ...e ascending node|Longitude of the<br> ascending node]]
    42: | 113.715 04&deg;
  8. Uranus (15207 bytes)
    1: ...margin: 1em 1em 1em 0; border: 1px #aaa solid; border-collapse: collapse; font-size: 95%;" style="floa...
    5: <small><font color="white">Click image for description</font></small>
    48: | 0.769 86&deg;<br>(6.48? to Sun's equator)
    50: ...e ascending node|Longitude of the<br> ascending node]]
    51: | 74.229 88&deg;
  9. Neptune (planet) (18545 bytes)
    1: ...margin: 1em 1em 1em 0; border: 1px #aaa solid; border-collapse: collapse; font-size: 95%;" align="righ...
    4: ...2]]<br><small><font color="white">Click image for description</font></small>
    47: | 1.769 17&deg;<br>(6.43? to Sun's equator)
    49: ...e ascending node|Longitude of the<br> ascending node]]
    50: | 131.721 69&deg;
  10. Pluto (planet) (26470 bytes)
    1: ...margin: 1em 1em 1em 0; border: 1px #aaa solid; border-collapse: collapse; font-size: 95%;" style="floa...
    10: | [[Clyde Tombaugh|Clyde W. Tombaugh]]
    48: | 17.141 75&deg;<br>(11.88? to Sun's equator)
    50: ...e ascending node|Longitude of the<br> ascending node]]
    51: | 110.303 47&deg;
  11. Ice age (15810 bytes)
    4: ... sense; and use the term 'glacial periods' for colder periods during ice ages and 'interglacial' for t...
    10: ...theory, and Agassiz published it in his book ''ɴude sur les glaciers'' of [[1840]].
    16: ...[Snowball Earth]] in which permanent sea ice extended to or very near the equator. It has been sugges...
    20: ...,000 year time scales. The last glacial period ended about 10,000 years ago. A [http://www.scotese.c...
    22: ...America in polar regions, the Earth today is considered to be prone to ice age glaciations.
  12. Climate change (15859 bytes)
    5: ... recent climate change]]. For global warming episodes in the geological record, see [[Permian-Triassic...
    8: ...led [[climate forcing|climate forcings]], are divided into natural factors, such as variations in [[so...
    12: ...nts associated with the [[Canadian Shield|Laurentide]] ice sheet and thus count as "internal variabili...
    18: ...te system varies between chaotic and non-chaotic, depending on the state of the external forcing.
    23: ...riod"]). See also the discussion at [[carbon dioxide]].
  13. Moon (37975 bytes)
    2: ...ight" style="float:right; margin: 0 0 1em 1em; border-collapse: collapse;"
    44: ...ascending node|Longitude of the<br /> ascending node]]
    56: | 3,476.2 km [http://www.onasch.de/astro/showobject.php?lang=en&head=f&anim=129&obj=...
    73: ! align="left" | Mean [[density]]
    94: ! align="left" | [[Declination]]
  14. Ice Age (15809 bytes)
    3: ... sense; and use the term 'glacial periods' for colder periods during ice ages and 'interglacial' for t...
    9: ...theory, and Agassiz published it in his book ''ɴude sur les glaciers'' of [[1840]].
    15: ...[Snowball Earth]] in which permanent sea ice extended to or very near the equator. It has been sugges...
    19: ...,000 year time scales. The last glacial period ended about 10,000 years ago. A [http://www.scotese.c...
    21: ...America in polar regions, the Earth today is considered to be prone to ice age glaciations.
  15. Wind power (27669 bytes)
    1: ... deals mainly with the intricacies of large-scale deployment of wind turbines to generate [[electric p...
    3: ...wind power over the United States. This type of undetailed map is most useful for scouting for offshor...
    9: ...st of this wind energy can be found at high altitudes where continuous wind speeds of over 160 km/h (1...
    11: ...are extremely complicated and relatively little understood, the basics of its origins are relatively s...
    13: ...d night, the [[Coriolis effect]], the irregular [[albedo]] (reflectivity) of land and water, humidity, and...
  16. Arctic Ocean (7316 bytes)
    7: ... [[Greenland]], and a number of islands. It includes [[Baffin Bay]], [[Barents Sea]], [[Beaufort Sea]...
    9: ...of [[continental shelf]] extant on the Eurasian side [http://www.marianatrench.com/mariana_trench-ocea...
    12: ...]], meeting with warmer air in the middle [[latitude]]s and causing [[rain]] and [[snow]]. Little mari...
    23: There is considerable seasonal variation in how much [[pack ice]] ...
    26: ...e highest percentage of any ocean) with the remainder a central basin interrupted by three submarine r...
  17. Water (15217 bytes)
    1: ...ies of pure water (H<sub>2</sub>O) (dihydrogen oxide).''
    15: ... the first time: [[hail]], [[snow]], [[fog]] or [[dew]] for example. When appropriately lit, water dr...
    17: ...iding river [[valley]]s and [[delta]]s which provide rich soil and level ground for the establishment ...
    21: ...taste or smell very differently. In fact, we have developed our senses to be able to evaluate the drin...
    26: ...density]] at 4&deg;[[Celsius|C]]: it becomes less dense as it [[freezing|freezes]] or [[heat]]s up. As...
  18. Contrail (4281 bytes)
    9: ...mes '''vapour trails'''): artificial [[cloud]]s made by the exhaust of [[jet engine|jet]] [[aircraft]]...
    15: ... [[saturation]] or [[dew point]]). This causes condensation to occur, and the contrail to form.
    17: ...he exhaust into a freezing environment, (as altitude increases, the atmospheric temperature drops) whi...
    19: ... drop in temperature, which can cause water to condense out of the air and form a contrail.
    26: ...erence of day and night temperatures) was about 1 degree Celsius higher than immediately before. This ...

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