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the Louisiana purchase is different from space explorations because Lewis and Clark had to find something - I guess. And space travel is traveling into space.
Curiosity
false
Making spacecraft,space shuttle and artificial satellites
problems of astronaut encounter in space explorations
It cost about 35 billion dollars to explore space.
Launching space explorations. Most notably putting the first man on the moon.
So far, no explorations have been made on Jupiter. Not even the most sophisticated space programs in the world are able to make that kind of voyage at this time.
In the United States, the National Aeronautics and Space Administration (NASA) is involved with space exploration.
Underground excavations, space explorations, and other dangerous tasks.
not a discovery for AIDS
unpiloted aircrafts can not generally react as well to unexpected events as opposed to piloted aircrafts.