PaleBlueDot_AVisionoftheHumanFutureinSpa.epub - (EPUB全文下载)

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Pale Blue Dot: A Vision of the Human Future in Space
Carl Edward Sagan
A thousand years from now, our epoch will be remembered as the time when we first left the Earth and saw it from beyond the outermost planet as a pale blue dot, almost lost against the backdrop of the stars. As we complete the preliminary reconnaissance of our Solar System, we hunger for a long-term vision of the human future. Now, the astronomer who brought the Universe to so many people answers that call—suggesting that our very survival depends on the exploration and settlement of other worlds. Pale Blue Dot reveals how science has revolutionized our understanding of where we stand and who we are and challenges us to weigh what we will do with that knowledge. Emerging out of our sometimes reluctant recognition of our true place in the Cosmos comes a vision of an exhilarating future with a surprisingly spiritual impact.
Carl Sagan
Pale Blue Dot:
A Vision of the Human Future in Space
For Sam
Another wanderer,
May your generation see
Wonders undreamt.
Spacecraft Exploration of the Solar System.
Notable Early Achievements
United States
1958 First scientific discovery in space-Van Allen radiation belt (Explorer 1)
1959 First television images of the Earth from space (Explorer 6)
1962 First scientific discovery in interplanetary space -direct observation of the solar wind (Mariner 2)
1962 First scientifically successful planetary mission (Mariner 2 to Venus)
1962 First astronomical observatory in space (OSO-1)
1968 First manned orbit of another world (Apollo 8 to the Moon)
1969 First landing of humans on another world (Apollo 11 to the Moon)
1969 First samples returned to Earth from another world (Apollo 11 to the Moon)
1971 First manned roving vehicle on another world (Apollo 15 to the Moon)
1971 First spacecraft to orbit another planet (Mariner 9 to Mars)
1973 First flyby of Jupiter (Pioneer 10)
1974 First dual-planet mission (Mariner 10 to Venus and Mercury)
1974 First flyby of Mercury (Mariner 10)
1976 First successful Mars landing; first spacecraft to search for life on another planet (Viking 1)
1977 First flybys of Saturn (Pioneer 11)
1981 First manned reusable spacecraft (STS-1)
1980 First satellite to be retrieved, repaired, 1984 and redeployed in space (Solar Maximum Mission)
1985 First distant cometary encounter (International Cometary Explorer to Comet Giacobini-Zimmer)
1986 First flyby of Uranus (Voyager 2)
1989 First flyby of Neptune (Voyager 2)
1992 First detection of the hel ............

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