jamie smells
It does not have to be brought back to earth and so costs less money
Yes, Voyager II has. (Voyager II is an unmanned space probe).
Advantages of manned space missions include the ability for humans to conduct real-time decision-making and problem-solving, as well as the potential for greater scientific discovery and exploration. Disadvantages include the high cost and risk associated with sending humans into space, as well as the limitations on how far and long humans can travel compared to unmanned missions.
Unmanned space missions are space exploration missions that do not involve human astronauts on board. Instead, spacecraft are sent with robotic systems and instruments to gather data, conduct experiments, or explore celestial bodies. These missions are valuable for studying distant planets, asteroids, and cosmic phenomena without risking human lives.
A manned spaceflight involves sending humans into space, while an unmanned spaceflight does not have any humans on board and is typically controlled remotely from Earth. Manned missions require life support systems and provisions for crew safety, while unmanned missions can be more cost-effective and are often used for scientific research or exploration in environments that are dangerous or inaccessible to humans.
The cost of sending missions to space varies depending on the type of mission. Sending astronauts to the International Space Station can cost around $80 million per seat on a commercial spacecraft. Unmanned missions such as rovers to Mars can cost anywhere from hundreds of millions to billions of dollars. Overall, NASA's annual budget for all its operations, including space missions, is around $22-23 billion.
As of 2021, NASA has completed over 200 manned and unmanned space missions, including robotic missions to planets, satellites, and the International Space Station. These missions have helped advance our understanding of space exploration and the universe.
manned space probe is when there are people traveling in a spaceship. whereas unmanned is when there is nobody in a ship unmanned is launched for the first time to a planet to see that a manned can land.
The Pioneer space probes are a series of unmanned space missions sent out by the United States for the purpose of planetary exploration.
I am not sure if by "space mission" You mean a mission to a distant object or into deep space or manned or unmanned. Voyager I and II are unmanned deep space missions, both launched in 1977. More than thirty years later they are both still running (as of today: March 10, 2010). The unmanned Mars Exploration Rovers Spirit and Opportunity were rover launched to Mars in 2004. Opportunity is still running fine but Spirit is stationary because two of its six main wheels have stalled. The Apollo Missions were manned moon missions in the nineteen-sixties and seventies. They were also very successful.
NASA has sent several unmanned space probes to Saturn, but no manned missions.
The Pioneer space program was a series of unmanned missions to explore the planets in more detail. It was a US space program.