Simply
put, gravity is a force of attraction
that pulls two
objects together.
It
is an invisible force that depends on the mass of each
object as well as the
distance between each objects' center.1
We experience Earth's gravity all the time. In fact, it is
the force that holds the entire universe together.2
Gravity is among the four fundamental interactions found in
nature,
which includes electromagnetism, the strong nuclear force, and the weak nuclear
force.3
The following pages provide a brief history of the major
scientists
who have contributed to the understanding and science of
gravity.