When you look up at the night sky, you’re seeing the long-ago light from distant stars. But how can you know how far away they really are? You can’t exactly roll out a measuring tape. Luckily, there’s ...

Units of speed are always a unit of length per unit of time. Different units of length and time may be chosen depending on the situation. This makes it easier to read the measurements. For example, ...

Ever notice that some runs and races are more satisfying than others? These workouts aren’t necessarily the easiest runs or even the ones that are the most fun. Instead, they’re fulfilling because the ...

Cepheid variable stars exhibit regular pulsations whose period directly correlates with their intrinsic brightness (absolute luminosity). The Leavitt law establishes this relationship between ...

Hitting into the wind can be extremely challenging on the golf course, making holes play longer and causing havoc with your ball flight. Learning how to calculate distance in the wind is a crucial ...