Where was the first satnav invented?

Do most scientist agree with world ending 2012? Where was robonaut sent in space? What would cause a balloon to expand if taken to top of mountain? What is the color distortion caused by lenses called? How do temperature difference in the protoplanetary disk explain the arrangement of the planets in the solar system? Why does a long distance air craft fly in a lower part of the stratosphere? What does it take to make rain form? What will die out first the Orion star or our sun? What are the stars named in Leo the lion? Where is unmanned exploratory spacecraft called? Why don't space shuttle astronaut in orbit hit their heads on the ceiling of the falling shuttle? Why were the viking spacecraft sterilized before they were launched? How can you see stars if they are millions of light years away? What are the sizes of the stars in the Big Dipper? What direction should solar homes face? What would you need to be able to live on mars? What unpredictable disaster might befall a mining colony on a large asteroid? What is rainbow shadow of a mountain? What is the angular difference between true North and magnetic North is called? Who was responsible for the development of the rocket motor?