克卜勒行星運動定律

Kepler

Kepler, by Walter W. Bryant“I’m sure you remember that Tycho Brahe had his own system of the universe. In a tychonic system, the earth was stationary ...

Car Hunter

Take awesome car photos with CarHunter - the photo app for car enthusiasts! - Car specs: Pimp your car photos by adding specs such as top speed, accel...