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- Space exploration (14877 bytes)
1: ...e, and politics regarding [[outer space|space]] endeavors. One of the most famous and important aspec...
4: ... technological and scientific breakthroughs, the idea of outer-earth missions was no longer a dream, b...
6: ... one place: [[Space Shuttle Enterprise]], a Concorde and scores of aircraft. The [[U.S. Space & Rocket...
11: ...rface. The United States sometimes uses a 50 mile definition. (See [[boundary to space]].)
13: ...ovember 3]], [[1957]]. The first orbital flight made by a human being was [[Vostok 1]], carrying [[Yur... - 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... - Lightning (33113 bytes)
2: ...ning strokes are observed during a night-time thunderstorm.]]
6: ...e air, producing lightning's characteristic [[thunder]] sound.
10: ...but while waiting for its completion, he got the idea of using a flying object, such as a [[kite]] ins...
12: ...fallen during the storm had soaked the line and made it conductive.
14: ...ted the original high-object-with-some-spark-gap idea that they used, so he usually gets the credit. - Satellite (6584 bytes)
2: ...wn as its ''primary''). The term is often used to describe an '''artificial satellite''' (as opposed t...
4: ... the [[center of mass]] of the two objects is inside the other object.
11: In [[May]], [[1946]], the [[Preliminary Design of an Experimental World-Circling Spaceship]]...
13: ...Earth's atmosphere|atmospheric]] [[pressure]], [[density]], and [[temperature]] up to 200 [[kilometre...
15: ...and [[propaganda]]. In [[1954]], the Secretary of Defense stated, "I know of no American satellite pro...
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