How does light energy form?

Why do the moons stay in orbit around Jupiter? What year was it proved that space travel was possible? What is the biggest blue diamond in circulation? What four elements are named after planets? Is a telescope with incoming light passing through glass refracting? How long does it take for the space station to go around the Earth? Why does hillary examine norgays oxygen equipment? How does the moon's gravitational pull affect Earth's tides? How do you give clue for helicopter? What was the date 16 weeks ago? Is spaceship Earth closed? Why is the southern cross only visible in the Southern Hemisphere? What device is useful to look at the moon? A star begins as a ball of gas and dust pulled by together by? What is the wheel under the stage that adjust the amount of light called? Does the moon spin on its axis"? What season does Cetus appear in? Why was the first alarm clock invented? What improvements enabled greater navigational reach in sailing technology? What percent of xenon is in the air?