There ent none
there is no man in the space craft
an unmanned space probe is a satellite orbiting around the planet
Unmanned - Space probes are a form of robotic spacecraft.
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.
The first unmanned rocket to fly in space was the Russian Sputnik.
Several advantages; mainly:A human needs food, air, and protection. An unmanned craft needs none of these; its use of energy and other "extras" is much less than for a human.An unmanned craft can be sacrificed; there is no moral obligation to return it safely to Earth.In summary, all this makes an unmanned spacecraft much cheaper than a manned spacecraft.
there is no man in the space craft
an unmanned space probe is a satellite orbiting around the planet
Unattended machinery space (Unmanned operation E0). Conformity is tested during sea trial.
Unmanned - Space probes are a form of robotic spacecraft.
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.
Yes, Voyager II has. (Voyager II is an unmanned space probe).
The first unmanned rocket to fly in space was the Russian Sputnik.
This is because sending men up into space costs a lot more money than sending probes or other unmanned space craft. When you send a crew of people up you need to provide their living space, food, air, etc so they can survive. Holding all that would make the ship larger and cost more than a smaller unmanned ship. Also unmanned crafts can travel longer distances. No human wants to go on a 10 year journey where they might end up killed, these droids can do this for them.
normally they are unmanned but sometimes they do have people sent up
All space telescopes are unmanned - unless you want to count the small telescopes on the Shuttle or IIS as space telescopes.
No, space probes are unmanned.