What is tronosphere?

What are the two things that occu rin the troposoher that make it very important? How much does food for space cost and weigh? Why can pecan nuts be take in to space? What color is Aludra star? What is the name of the first manned mission to the moon? What is the Gravitational Strength on earth? Does the International Space Station have some type of motor? What are the three names of the robot sent to mars? What would happen if the moon fell apart? How far is tau ceti? At what time is the new moon highest in the sky? How long can stalactites and stalagmites grow? Planet other than the earth that has visible water ice on it? Can someone please explain why Rygel has a red eye in season four of Farscape? What is the meaning of 18 balloons in a debut? Is the moon a huge rock? How did sputnik impact each country's space program? WHY is the moon yellow or white? What happens to a balloon if taken to a top of a mountain? One type of radioactive device that indicates the intensity of radiation with a clicking sound that increases in frequency as more radiation is present is a?