What is theTrophosphere?

Why an atmosphere rich in oxygen was important for the evolution of life? How much did Alexander graham bell weigh? Who created the first modern rocket? What is the planet Phoebe? When a cloud fragment has compressed enough so that it glows? What are things NASA invented? What phase of the moon is hardest to see? What is the day in honor of the sun lord? Is the Rigel star a high mass star or a low mass star? When is the best time to see the columba constellation? What are Saturns neighboring planets? Why doesn't gravity pull the artificial satellites to Earth? What is an example universe? Is the word sun a concrete noun? What was the name of the American space ships which were used to travel to the moon? Which Apollo mission had to abandonits Moon landing and return to Earth because of an emergency? What planet has over 200 days a year? What type of wavelength are commonly used to communicate with satellites? In Doctor Who what is Amy Pond's real name? What Specific branch of science that study asteroids?