Our motion perception is remarkably well tuned to detect small changes in speed and direction. For example, soccer goalkeepers need to precisely judge the speed, direction, and curvature of an ...

With the international space station going up, and Russia’s Mir space station coming down, it’s a good time to “get down” about gravity. Understanding weightlessness is important not only for space ...

Humans sometimes have difficulty orienting themselves in low-gravity environment. In this image from Dec. 12, 1972, NASA astronaut Jack Schmitt topples over after losing his balance during an Apollo ...

All objects in the absence of air resistance (friction) fall at the same rate regardless of their mass. Due to gravity the speed of an object dropped from rest from a height will increase at the rate ...

If you drop an object, it will fall. It's a motion that we’ve all seen hundreds of times. We’ve also all seen plenty of the moon, which makes one complete orbit around our planet every 27.3 days (as ...