What is photoperiodisom?

How can you speed up travel in outer space? How do precipitation and the atmosphere help a plant grow? What kind of precipitation do stratus clouds give? The layer of the atmosphere where temperature begins to increase with altitude? How many stars did the first flag on pikes peak? What do you call it when the moon casts a shadow on the earth? What day was 23rd August 1967? When did Robert Stephenson make the Rocket? Is the moon the only thing that affects tides? What causes the gas and dust in a nebula to contract? What is the 40 objective lens on a microscope? Why is the suns spectrum and the moon's spectrum the same? What can you cook in a cardboard solar oven? What In the northern hemisphere the coriolis effect causes winds to curve in which direction? When did john glenn leave the nasa? What is a spectrumscope? What company has a blue boy sitting on a moon? Who invented a laser pointer? Where does the name constellation come from? How many countries have sent their spacecraft on the moon?