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The second American maned space program was the two man spacecrafts called the Gemini.
No manned missions have gone farther away than the moon. If you mean space probes or satellites, I think three
The most obvious answer to your question is the fact that people have to return to earth, while an unmanned craft can stay in space infinitely. Manned spacecraft require things like oxygen, water, food and communications equipment, none of which are required by an unmanned spacecraft. That means unmanned spacecrafts can be sent into space for a fraction of the cost of a manned spacecraft. So basically, it's much cheaper and safer to send unmanned spacecrafts to explore the universe.
spacecrafts
There have been none. Well, not to Saturn anyway.
Alan Shepard was the firts American Astronaut
Satellites can't get repaired after launching but manned spacecrafts are repaired by Human space-walking.
The second American maned space program was the two man spacecrafts called the Gemini.
Humans have build a wide range of spacecraft in their voyage of space discovery, some manned and some not. A few of these include Vostok, the first manned spacecraft and the Colombia Orbiter which is considered a space plane.
Spacecrafts
No manned missions have gone farther away than the moon. If you mean space probes or satellites, I think three
The most obvious answer to your question is the fact that people have to return to earth, while an unmanned craft can stay in space infinitely. Manned spacecraft require things like oxygen, water, food and communications equipment, none of which are required by an unmanned spacecraft. That means unmanned spacecrafts can be sent into space for a fraction of the cost of a manned spacecraft. So basically, it's much cheaper and safer to send unmanned spacecrafts to explore the universe.
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Although several spacecrafts have been sent to Venus, no alien spacecrafts have been discovered on its surface.
It is calculated by using a branch of Newtonian mathematics called orbital mechanics.
Nuclear energy provides energy, not a push of motion.
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