Retrograde motion, typically observed in outer planets, is an apparent westward movement resulting from Earth's faster orbital speed overtaking those planets. This apparent reversal of direction is ...

This is the fourth article in the Mind Matters series on the neuroscience behind visual illusions. Benjamin Franklin once said, “Never confuse motion with action.” But if motion is not action, then ...

In 350 BC, Aristotle reported seeing illusory movement after staring at a constantly moving stimulus. Later coined the "waterfall illusion," scientists are still investigating the properties of motion ...

THE AESTHETIC APPEAL of symmetry is obvious whether you are a child playing with a kaleidoscope or a Great Mogul emperor building the Taj Mahal as a monument to eternal love. That preference, as it ...

Clouds move in response to the local winds. Although the air immediately around you may be still, the winds are far stronger thousands of metres higher up. That is why clouds are usually in motion, ...