Sputnik
Unmanned - Space probes are a form of robotic spacecraft.
Robotic spacecraft
space probe
there is no man in the space craft
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Unmanned - Space probes are a form of robotic spacecraft.
Robotic spacecraft
it has to have had no humans
A space probe is an unmanned spacecraft sent into space.
space probe
there is no man in the space craft
Spacecraft is the generic term there are both manned and unmanned types such as satellites for the unmanned variety.
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a space probe.
The first American spacecraft designed to hold two people was the Gemini capsule, which made its maiden voyage into space (unmanned test flight) in April, 1963. The first Soviet spacecraft designed to hold two people was the Voshkod capsule, which made its first unmanned test flight in June, 1964.
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.
Satellites are unmanned spacecraft, and the term unmanned space vehicle could also apply. A spacecraft is a vehicle or machine that is used in space, and there are many different kinds with a variety of missions. Satellites are used for communications, navigation, and planetary observation (including exporation, meteorology and intelligence gathering) to name a few of their applications. Use the link below to learn more about spacecraft.