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**Various Instruments that are involved in space probes/ spacecrafts are:** ** Power sources of a space craft ** : Some power sources of a spacecraft can include: batteries, which store energy made on Earth and release it as electricity. Solar Panels which convert light from the Sun into electricity. Radioisotope thermoelectric generators**,** or RTGs, which uses the fact that radioactive materials, encased in a sealed shell, will generate heat as they decay into non-radioactive materials. Fuel cells which are somewhat like batteries, storing power in the form of separated oxygen and hydrogen. A thin membrane between the two elements harnesses the energy separated when the oxygen and hydrogen combine to form water. [] [] [] http://nssdc.gsfc.nasa.gov/planetary/text/lp_pr_970312.txt [] [] [] [] [] [] http://nssdc.gsfc.nasa.gov/planetary/text/lp_pr_970312.txt [] [] []
 * Journ **** eys into Space: Space Probes and Spacecrafts **
 * ** Radiometers ** : this is a device that measures power (also none as radiant flux) of electromagnetic radiation. Usually the term “radiometer” refers to something that has the ability to measure radiation, but basically it measures electromagnetic wavelengths. This technology is a combination of multifrequency and polarisation measurements. It can be used on a spacecraft for microwaves.
 * ** Magnetometers ** : This is an instrument used to measure strength or direction of the magnetic field in the surrounding area of this instrument. Magnetometers are used often in spacecrafts to explore planets. Magnetometers are used in missions such as the mariner 2 and 10 and the Cassini-Huygens mission to explore Saturn. Magnetometers have found out about magnetic fields on planets such as: Earth, Moon, Sun, Mars, Venus and other planets.
 * ** Construction of a Spacecraft ** : Spacecrafts are usually made up of three motors. There are also many modules such as the command module, service module, and a lunar module. The total cost for a space craft is approximately $63 million, though it does vary depending on size and quantity. This example is from a spacecraft travelling with NASA, including launch, operations, data analysis and parts. For this particular spacecraft it is 4.5 feet high and 4 feet diameter. There are also solar cells that are on top of the spacecraft mounted on it to provide energy, for this spacecraft it provides 200 watts of power. This spacecraft weighs around 660 pounds but once again it really depends on the size. For a single mission it can take around 5-10 years.