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.
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Your microphone is muted
For help fixing this issue, see this FAQ.