In which layer of atmosphere do the aeroplanes fly?

What is the Greek and Roman name for the Sun? What is the smallest possible black hole that can exist in the universe? Did Apollo 13 make it back to earth? What year did john glen orbit the moon? What is the birthplace of Apollo? What happens when the sun's rays hit the Earth's surface? How many raindrops create the rainbow? Some areas of the Earth receive more solar radiation than others. Which of the following results from the Sun's uneven heating of the Earth? What is Frank ieros star sign? Why did Neil Armstrong walk on the moon before Buzz Aldrin? Where was Newton from? The minimum and maximum salary for an astronomer? What clouds are often found in lower altitudes and spread across the sky? How wide was the valletta tornado? Does the m101 revolve? Which was the first object that landed on moon? Which planet is closer to the sun than earth but farther from the sun than mercury? If dropped a quarter from space would it fall to earth? Astronaut John Glenn was the first American to do what? Can a Concorde go to the edge of space?