What is the plural form of astronaut?

Why does a rocket need a large thrust on take off from the earth? What layer of the atmosphere contains our ozone layer? How is water conserved on a space station? What is the magnification of the eyepiece lens in a microscope? What was name of the spacecraft of Apollo 17? What is the name of one convection cell that forms because of the Coriolis effect? How loud is the sun compared to other celestial bodies in the universe? Why does the satellite Callisto have so many craters while Io has so few craters? What is the name of the constellation that point to the north star? What is an example of what each electromagnetic spectrum does? at which temperature the water condense? One star is reddish and another is bluish Do you know anything about the relative temperatures of the two stars? What is the problem in the story of where the mountain meets the moon? What do you have when earth moves into the Moon's shadow? God that rides the chariot across the sky? Why is mesosphere so important? When is the last time we went to the moon? What did Hubble discover in 1929? Is there a fat man on the moon? Who became the first man to go up to space in 1961?