The force that one massive object excerts to attract another object is called

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

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

Which accurately compares concave and convex lenses?