One problem of sending unmanned missions into space?
The manned space program is just what it says. It's a program to send humans into space. Unmanned vehicles have the advantage in that they don't have to return to earth. That means they can go further and stay in space indefinitely. Manned missions however, need to return its cargo back to earth. Manned missions have the advantage in that if something goes wrong, they can usually fix it in space. If something breaks on…
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…
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…
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.
we can learn many things from unmanned space probes, they can tackle tough terrains and function without air or lots of food, they can last long periods of time in space and don't get old.. for some space missions it can take years to get there for instance it would take 3 years to get to our closest neighbour mars..
First of all, unmanned space flights are a lot less-risky. Even in our advanced civilization space flight is still not a easy feat. Robotic probes and rovers can operate for a longer period on less energy, they are a lot cheaper, requires no food, no water, no plumbing and is generally a lot easier to operate. The disadvantages of unmanned space missions are obvious, six years of exploration of two rovers could be done in…
There have been seven manned missions, one of which, Apollo XIII, was unsuccessful, and many other unmanned missions. Considering that we haven't been there in almost a half century, the manned missions must be regarded as sort of technological demonstrations rather than the beginning of human ventures into space.
Crewed or "manned" missions have humans aboard to control the spacecraft and handle its operations (with an assist from computers and ground personnel). Space probes and long-term satellites have no one aboard. They are controlled from the Earth by means of telemetry (radio signals) with their onboard computers and other devices. Because of the constraints of fuel, food, and water, all current missions to other planets and outer space are necessarily unmanned or "robot" missions.
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.
On unmanned missions, its only requirement is as a combustion agent for the Hydrogen fuel used as a propellant. In manned missions, it is also required so that the astronauts can breathe without the need for a space-suit (at least inside the capsule/lander/shuttle/station). It is mixed with nitrogen and pressurised to simulate conditions on Earth (partly).
There have been seven missions launched and navigated to the moon with the intention of landing. Six of them landed and returned, while one failed to land but returned the astronauts to Earth. The USSR made three unmanned earth to the moon and return missions. The missions that landed pairs (2) of astronauts were Apollos 11, 12, 14, 15, 16, and 17.
What are advantages and disadvantages of sending crews to space on space explorations and space probes?
There have been no manned missions to Mercury (or any other planet) due to the great distances involved. Any attempt would require substantial thermal protection because of the intensity of the Sun's heat there. The first unmanned probe, Mariner 10, passed extremely close to the planet and took many photographs of the surface. Another unmanned NASA probe, MESSENGER, was launched in 2004 and will orbit the planet beginning in March, 2011.
NASA is working on the development of the Orion Spacecraft which will be the vehicle for the next phase in space exploration. The Orion will be able to travel to the moon and land, which is something the space shuttles were not capable of doing. Orion missions are planned for the Moon and Mars, and possibly some near Earth asteroids. NASA will also continue using standard heavy lift rockets for unmanned missions.
No. Neil Armstrong and the other Apollo astronauts are the only people ever to have stood on a celestial body other than the Earth. There have been other missions bringing people into space, and there are people on the International Space Station. There have also been many unmanned missions that involved landing on other planets, generally Mars.