Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
edwin hubble, isaac newton, albert einstein, aristotle, johannes kepler, nicolaus copernicus
edwin hubble, isaac newton, albert einstein, aristotle, johannes kepler, nicolaus copernicus
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
