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1. Helium (36603 bytes)
   2: {| width="250" border="1" cellpadding="2" cellspacing="0" align="right...
   4: {| align="center" border="0"
   26: | [[Density]]
   35: | 0.95 [[Kelvin|K]] (-272.2 °[[Celsius|C]])
   38: | 4.22 [[Kelvin|K]] (-268.93 °[[Celsius|C]])

Page text matches

1. List of elements by symbol (14812 bytes)
   58: <tr><td>Md</td><td>[[mendelevium]]</td><td>101</td><td></td></tr>
   61: <tr><td>Mo</td><td>[[molybdenum]]</td><td>42</td><td></td></tr>
   127: ...time to an isotope of [[radon]] identified in the decay chain of [[actinium]].</td></tr>
   134: <tr><td>Dp</td><td>[[decipium]]</td><td>62</td><td>Rare earth metal that ...
   135: ...[ekaboron]]</td><td>21</td><td>Name given by [[Mendeleev]] to an as of then undiscovered element. When...
2. Geology (12007 bytes)
   3: ...d [[uranium]]. Additional economic interests include minerals such as [[asbestos]], [[perlite]], [[mic...
   7: ...ween earthly and [[Theology|theological]] jurisprudence.
   10: ...f the [[mountain]]s and by [[Deposition (geology)|deposition]] of [[silt]].
   12: ...ks ''Peri lith&#333;n'' by [[Theophrastus]], a student of [[Aristotle]], remained authoritative for mi...
   14: ...etallica libri XII'', with an appendix ''Buch von den Lebewesen unter Tage'' (book of the creatures be...
3. Age of the Earth (20052 bytes)
   1: ...difficult to define. This article describes the modern dating methods used to arrive at the age of the...
   4: ...ved in a similar date, and some today continue to defend [[young earth creationism]] (see [http://www....
   6: Few people had conceived the idea of a time that stretched far into the past befor...
   9: ...of [[Russia]]n science, was one of the first to undertake this exercise, suggesting in the mid-[[18th ...
   11: ...h]] naturalist the [[Georges-Louis Leclerc, Comte de Buffon|Comte du Buffon]] tried to obtain a value ...
4. Sun (20830 bytes)
   2: ...="margin: 0 0 1em 1em; border: 1px #aaa solid; border-collapse: collapse;" align="right" width=280px
   13: ! align="left" | [[Apparent magnitude|Visual brightness]] (''V'')
   16: ! align="left" | [[Absolute magnitude]]
   48: ! align="left" | Density
   76: | 7.25[[degree (angle)|?]] <br>(to the [[ecliptic]]) <br>67....
5. Planet (8450 bytes)
   1: ...jects in orbit around other stars, the problem of defining a planet has become rather more acute.
   3: ... gas and dust that orbited the [[protostar]] in a dense protostellar disk before the star's core ignit...
   16: ...Mars]] (&#x2642;) - 2 satellites ([[Deimos (moon)|Deimos]], [[Phobos (moon)|Phobos]])
   25: ... size between Mercury and Ceres, which would include the five objects mentioned above (Pluto, Sedna, O...
   27: Planets within Earth's solar system can be divided into categories according to composition.
6. Mercury (planet) (22924 bytes)
   1: ...anges from &minus;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'...
   28: ...of Earth compresses the planet and creates a high density. Mercury has only 5.5% of Earth's mass. The ...
7. 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;
8. 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;
9. 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;
10. 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;
11. Hot air balloon (8769 bytes)
    1: ...by [[Pilⴲe de Rozier]] and the [[Marquis d'Arlandes]]. Balloons that can be propelled through the ai...
    6: ..., during the flight. Recent balloons have been made in fantastic shapes, such as hot dogs, rocket shi...
    9: ...ion of the hydrogen balloon, hot air ballooning faded into obscurity until being reborn in the [[1960s...
    11: ...ute-long flight started in [[Philadelphia]] and ended in [[Gloucester County]], [[New Jersey]]. The f...
    17: ...anterns nowadays, are still being flown in China, despite the risk of causing a fire upon landing.
12. Atom (12300 bytes)
    1: {| border="1" cellspacing="0" align="right" cellpadding="2...
    7: | align="center" | '''Helium atom model (not to scale)'''<br>Showing nucleus with two pr...
    43: ...or example, technetium and californium have been identified in supernovae.
    48: ...her types of chemical compounds. Molecules are made up of multiple atoms; For example, a molecule of ...
    50: ...on quantum effects, such as in [[Bose-Einstein condensate]].
13. History of astronomy (13532 bytes)
    2: [[Astronomy]] is probably the oldest of the [[natural science]]s, dating back to [[a...
    8: ...ers were [[priest]]s ([[Magi]]), and that their understanding of the "[[heaven]]s" was seen as "[[divi...
    10: ...alendar is based on the Roman calendar, which divided the year into twelve months of alternating thirt...
    14: ...ennium BC, but their contents appear to be much older.
    20: ... that took the earth to spin on its axis and considered the motions of the planets with respect to the...
14. Earth's atmosphere (10093 bytes)
    3: ...tries.jpg|thumb|250px|right|Geograhy Clipart provided by [http://classroomclipart.com Classroom Clip A...
    5: ... designated as [[Astronaut|astronauts]]. An altitude of 120 km (75 mi or 400,000 ft) marks the boundar...
    8: ...ical relationship]] between temperature and altitude varies between the different atmospheric layers:
    10: ...ding on latitude and weather factors, temperature decreasing with height.
    12: ...50 km to the range of 80 km to 85 km, temperature decreasing with height.
15. Aviator (3951 bytes)
    2: ... can be applied more broadly, for example to include people such as [[Wing-walking|wing-walkers]] who ...
    6: ...te authority given to the ''Pilot in Command'' is derived from that of a ship?s captain.
    8: ...for information on license requirements). The [[Federal Aviation Administration]] controls the issuanc...
    11: <!-- ugh - does anyone know how to code HTML for balanced columns? -->
    34: *[[Geoffrey de Havilland]]
16. Blimp (3839 bytes)
    1: ...elium]]) inside the envelope. For a more complete description of this style of [[aircraft]], please se...
    7: ...h;but there seems to be no record of any official designation of non-rigids as 'limp'. Further, accord...
    17: ...se them for advertising, and as platforms to provide aerial shots of sporting events.
    23: ...o, such as above an erupting volcano. Blimps are ideal as they can hover, and are less likely to be da...
    25: ... [[landmine]]s are present in areas using ultra-wideband [[synthetic aperture radar]] units mounted on...
17. Aircraft (13315 bytes)
    15: ... use a spinning rotor (a ''rotary wing'') to provide both lift and thrust. The abbreviation [[VTOL]] i...
    18: ...n particular, these aircraft use a relatively low density gas such as [[helium]], [[hydrogen]] or heat...
    24: Below, we describe classifications by design, propulsion and usage.
    29: ====By design====
    33: A first division by design among aircraft is between lighter-than-air, '...
18. Chemical element (8169 bytes)
    1: ... '''element''', is a substance that cannot be divided or changed into different substances by ordinary...
    2: ...thumb|200px|Chemistry Flask Clipart .Clipart provided by [http://classroomclipart.com Classroom Clip A...
    3: ...are [[radioactive]] and in undergoing radioactive decay transmute into a different element.
    5: ... the [[Big Bang]]. All the heavier elements are made naturally and artificially through various method...
    7: ...present at the formation of Earth have long since decayed.
19. 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]]
20. Berkelium (5697 bytes)
    2: {| border="1" cellpadding="2" cellspacing="0" align="right...
    5: {| align="center" border="0"
    21: | [[Actinide]]s
    41: | [[Density]]
    47: {| border="1" cellspacing="0" cellpadding="2" width="100%"

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