The strength of gravity between two objects is determined by objects mass and

Found this on google, "Remember that the net force on you determines how your motion changes. ... The strength of the gravitational force between two objects depends on two factors, mass and distance. The Mass of the Objects The more mass two objects have, the greater. the force of gravity the masses exert on each other."

true, as the earth rotates the sun hits the surface of the planet; causing the day and night cycle.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.