What is photoperiodisom?

What does size tell us about the luminosity of stars? Why does the moon sometime appear orange? How old was Neil Armstrong when he first stepped onto the moon? What is called the worlds greatest open air musuem? How does a space shuttle dock with a space station? When can I see the International Space Station from 02760? What are the effects of the discovery of gravity? Do light weight objects spin in a bigger circle than heavy objects? What kind of clouds are flat and indicate it will be cloudy and may rain? What are the 2 main types of man made satellite? How does gravity keep from spinning off into outer space? The Doctor Who episode did the Eleventh doctor and the Tenth Doctor meet in? What are all the cloud names? What kind of rotation is called prograde? Why is the moon shining so brightly today? What romantic word do you get when you combine a substance that bees make with a part of the solar system? How long did it take to build the temple of Delphi? What does the sputnik have to do with the cold war? What is the semi-major axis of the Earths orbit around the Sun? Why is it important to ask for permission before carrying out a observation?