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.
((planck constant)^3/G/(10 kpc)^2/(200 km/s))^(1/4)*(speed of light)^2/(1 eV)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random