One angstrom is equal to _________ .
Spaceflight that landed Neil Armstrong to the moon is ____________.
Neil Armstrong and Buzz Aldrin landed on the moon in 1969. There, Neil and Buzz decided to calculate the time taken by things to reach the ground. So Neil dropped a ball from height 7.35 m from the surface of the moon and Buzz was supposed to record the time taken. How much time did it take for the ball to touch the surface?