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- Solar system (21174 bytes)
5: ...s many of these categories have been found to be less clear-cut than once thought. This encyclopedia e...
8: ...[planet]]s of the Solar System are those nine bodies traditionally labelled as such:
18: ...|550px|This illustration shows the approximate sizes of the planets relative to one another and the Su...
20: ...e Solar System, accompanied by their main satellites, profiled against the limb of the Sun]]
22: *Sizeable objects that orbit these planets are [[Natural satellite|moon]]s. For a c... - Space exploration (14877 bytes)
1: ...on in the [[space race]] between the [[United States]] and the [[Soviet Union]].
4: ... the development of adequate propulsion technologies, stronger and lighter materials and other technol...
6: ... next to [[Redstone Arsenal]] displays many articles of space hardware, including a full-size replica ...
11: ...ve Earth's surface. The United States sometimes uses a 50 mile definition. (See [[boundary to space]]....
13: ...4]], [[1957]]. This spectacular success led to an escalation of the American space program, and to an ... - Great Wall of China (10504 bytes)
1: ...of [[Ethnic groups in Chinese history|nomadic tribes]] coming from areas now in modern day [[Mongolia]...
3: The Wall stretches over a formidable [[1 E6 m|6,350 km]] (3,946 [[mi...
5: ...side of the wall could not cross with their [[horses]] or return easily with stolen property.
11: # [[1138]] - [[1198]] (the [[Five Dynasties and Ten Kingdoms Period]])
16: ...e Great Wall of China. It remains the world's longest manmade structure.]] - Timeline of United States history (1970-1989) (5473 bytes)
1: This section of the [[Timeline of United States history]] concerns events from '''[[1970]] to [[1...
5: ...71]] - [[Twenty-sixth Amendment to the United States Constitution|26th Amendment]] ratified
6: *[[1972]] - [[U.S. presidential election, 1972]] (including [[Watergate]]...
9: *[[1973]] - [[Skylab]], [[United States|USA]]'s first [[space station]] launched
10: *[[1974]] - [[Richard Nixon]] resigns Presidency over [[Watergate]] - Space Shuttle program (41074 bytes)
2: ...signed the External fuel tank and Morton Thiokol designed the solid rocket boosters.
4: ...was designed with the capacity to recover satellites and other payloads from orbit and return them to ...
6: ...as designed for a projected lifespan of 100 launches or 10 years operational life.
10: ...further service missions to the [[Hubble Space Telescope]] (HST) are impractical, because the Orbiter ...
16: ... instances groups from both worked together to investigate the state of the art.
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