What do you think causes the changes in sunrise and sunset times over the course of the year?

What happens to light waves from a star as the star moves away from earth?

The amount of potential energy possessed by an elevated object is equal to what?

Aprisoner is forced to go into one of three rooms, but he can choose which room. the first room is ablaze with fire. the second one is rigged with explosives that will go off as soon as he enters. the third contains a pair of lions who haven't eaten in years. which room should he choose to survive?