The sensors being tested are those capable of hunting down fast-moving objects in space.

They spotted a fast-moving object on 26 April and messages went out to optical observatories to identify it.

However, movement that is too fast can be hard to track; some people find that fast-moving objects "disappear."

This is a common problem in the photography of fast-moving objects or people in motion.

But snatching a fast-moving object like your ship takes a great deal of effort and skill.

Shay called that "high gravity," which happened every time a fast-moving object changed direction.

It had reacted to the approach of a big, fast-moving object, but it still couldn't see a running man.

A high-speed camera is a device used for recording fast-moving objects as a photographic image(s) onto a storage medium.

This is a phenomenon that I've always attributed to the fact that the human eye cannot track a fast-moving object at such close range.

However, eyes are harder to spy on at a distance because they are fast-moving objects and require high exposure times.