A measure of the amount contained in or constituting a physical body.
A force that gravitation exerts upon a body equal to the mass of the body times the acceleration of gravity.
A factor or condition that is subject to change, especially one that is allowed to change in a experiment to test a hypothesis.
To verify or regulate a experiment by conducting a parallel experiment or by comparing to another slandered.
The outcome of a result or an act.
The distance from one point to another.
The science that deals with the material universe beyond the Earths atmosphere.
A expert in astronomy.
An arrangement of lenses, mirrors or both that collects light allowing direct observation on or photographic readings of distant objects.