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- List of explorers (24013 bytes)
1: ...sion]]). For the science fiction book, see [[Expedition (book)]].''
21: ...tish Empire|British]] naval officer, several expeditions to the [[Canada|Canadian]] [[Arctic]]
30: ...7]]?), [[Morocco|Moroccan]] [[Berber]] Muslim, visited [[Mecca]] several times, travelled to [[Central...
35: *[[Vitus Bering]]
36: *[[Vittorio Bottego]] (1860,1897), Italian explorer of the [[Giuba]] region in north-ea... - Comet (30542 bytes)
1: ....jpg|thumb|250px|[[Comet Hale-Bopp]], showing a white dust tail and blue gas tail (February 1997)]]
3: ...en [[carbon dioxide]], [[methane]] and [[water]] with [[dust]] and various [[mineral]] aggregates mixe...
9: ...an extend over 150 million km (1 [[Astronomical unit]]) or more.
11: ...om ancient sources, such as Chinese oracle bones, it is known that their appearance have been noticed ...
13: ....png|thumb|400px|Comets have highly elliptical orbits. Note the two distinct tails.]] - Space exploration (14877 bytes)
1: ...on the moon in the [[space race]] between the [[United States]] and the [[Soviet Union]].
4: ...that would be done. During the [[20th century]], with the development of adequate propulsion technolog...
10: ==Orbiting and reaching space==
11: .... The United States sometimes uses a 50 mile definition. (See [[boundary to space]].)
13: ...n orbit on [[November 3]], [[1957]]. The first orbital flight made by a human being was [[Vostok 1]], ... - Mercury (planet) (22924 bytes)
1: ...ation]] is 28.3?). Mercury has no [[natural satellite]]s. The only [[spacecraft]] to approach Mercury ...
3: ...e greek sun god [[Helios]]. [[Pythagoras]] is credited for pointing out that they were one and the sam...
10: ...t on Mercury's surface is 6.5 times as intense as it is on Earth, a total [[irradiance]] of 9.13 ...
12: ...[[Impact crater|crater]]s, where it has been deposited by [[comet]] impacts and/or gases arising from ...
16: ...med when lava flows buried earlier terrain. In addition, Mercury has "significant" [[tidal bulge]]s, r... - Venus (planet) (31010 bytes)
1: ...rcular]], with an [[eccentricity (orbit)|eccentricity]] of less than 1%.
3: ...ing Star]]", and when it is visible in dark skies it is by far the brightest [[star]]-like object in t...
5: ...ion of the goddess Venus's hand mirror: a circle with a small cross underneath ([[Unicode]]: ♀)...
7: ...e of its modern association with [[sexually transmitted disease]]s. Some astronomers use ''[[Cytherea...
14: ... between the night and day sides of Venus despite its extremely slow rotation (less than one rotation ... - Mars (27704 bytes)
1: [[Image:Mars.jpg|thumb|right|Mars, with polar ice caps visible.]]
2: ...A00161 modest.jpg|thumb|right|North Polar region with icecap. (Courtesy NASA/JPL-Caltech.)]]
4: ...of "the Red Planet." Mars has two [[Natural satellite|moon]]s ([[Phobos (moon)|Phobos]] and [[Deimos (...
6: ...ircle with a small arrow pointing out from behind it), is a stylized representation of the god [[Mars ...
8: ...[solar day]] on Mars is almost the same length as it is on earth: 24 hours, 39 minutes, and 35.244 sec...
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