How long would it take from one side to other in your milkyway with an airplane?

What is the definition of space missions? Why hasn't man been back to the moon since the 70's? How was the Milky Way galaxy formed? What jobs use ultra violet light? When was The Killing Moon created? When was the Beaufort scale invented? The planet has an orbital eccentricity most like the moon? How does the space shuttle slow down on re-entry? What was the teacher name who was killed in space shuttle? How wide is an f5 tornado? How deep is a black hole and what implications does its depth have on our understanding of the universe? Why and How do eclipses occur? What are some physical traits of the greek god Zeus? Why do the water droplets form on the window? What country was the first rocket launched from? What is gravitational force in space? What is energy from the sun known as? The Sun crosses the celestial equator going north This is known as the spring? What is the shape of half moon? NASA and the European Space Agency cooperated in the launch of what?