Earth is often described as a circle or an oval, but it is neither. As the planet spins more than 1,000 miles per hour at the ...

When humanity first started studying motion, circles posed a peculiar puzzle. Why do planets sweep endlessly around the Sun without flying off into the void of space? Why does a stone swung on a ...

Sadly, a disc could never approach the speed of light. If you had a high-strength steel disc that was 1-metre thick and 1 kilometre in diameter, it would come apart from centrifugal force at just 11 ...