What is a scratus?

What is the difference in temperature on a clear night and cloudy night? What is the origin of the word Helios? What is the biggest reason there are something in the ocean because of the moon? How many astronauts in Apollo 13? Did Sir Edmund Hillary scale the height 29028 feet? How are concave mirrors used in flashlights? Why was the kite important to the Chinese? What are lines of sight? What is -35 degrees celsius in fahrehneith? What is the color of the star megrez? How tall is mount Monte Rosa? How does a man tell the rose to go to the moon? What is a canis majoris? Earth's rate of revolution is very close to? What are the effects of absence of atmosphere on the moon? Why couldn't Psyche see Cupid? What is the thickclear jelly substance behind the lens? How long would it take light to traver around the world? What is the atenosphere? How does the earth emit light?