The cost of the mission was $4.4 billion.
It costs billions of dollars to get to Mars. The high costs include creating a spacecraft to support life on the way there, transporting food and water, and research.
a lot
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.
A robotic spacecraft, is a spacecraft with robots in it,
The cost of the mission was $4.4 billion.
It costs billions of dollars to get to Mars. The high costs include creating a spacecraft to support life on the way there, transporting food and water, and research.
Discovery class interplanetary missions run about $300 million. Big spy sat missions go for $1 billion or more.
The cost of a single spacecraft varies enormously. There vehicle itself may cost from a few hundred millions to several billion, (at these prices the currency is fairly irrelevant) depending on the services it provides. In addition there are launch costs and such servicing as may be possible and required.
a lot
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.
A robotic spacecraft, is a spacecraft with robots in it,
The cost for Voyager 2 and all it's missions was about $865 million dollars. The spacecraft itself was composed of about 65,000 individual parts.
Spacecraft is both singular and plural. You can have one spacecraft or many spacecraft.
3 days
The spacecraft that found asteroid951 was the Galileo Spacecraft..I think..
We haven't sent any spacecraft to Betelgeuse, it is much too far. However, the Hubble Space Telescope has studied Betelgeuse, so I guess that counts.