Learn how to calculate when and where two trains will meet! This video walks you through the process of using relative speed and distance to find the exact point and time of intersection. Perfect for ...

Speed is a measure of how fast something or somebody is moving. The units of speed are linked to the units of distance and time being used. A formula triangle is a quick way to calculate the speed, ...

There is an important and unresolved tension in cosmology regarding the rate at which the universe is expanding, and ...

Ask someone on Earth for the time and they can give you an exact answer, thanks to our planet's intricate timekeeping system, ...

Average speed cameras which were replaced a year after being cut down have been vandalised again. In November 2024, an ...

"A three-body problem is extremely complicated. Now we're dealing with four: the sun, Earth, the moon and Mars. The heavy ...

A Star Trek–inspired idea by Miguel Alcubierre kicked off decades of theory and experiments as scientists pursue plausible warp-drive designs and detection methods.

On Earth, knowing the time feels simple. Your phone pings the same second as a GPS satellite and an atomic clock in a lab.

New measurements using gravitational lensing suggest the universe’s current expansion rate does not agree with signals from the early cosmos.

It’s nothing fancy, but the single feeder outside my favourite window attracts a rotating cast of common birds ...

Learn how Albert Einstein’s theory reveals that time on Mars runs faster than on Earth — and why that tiny shift matters for ...

Here's how car speedometers calculate how fast your vehicle is going. And here's why they may not always be accurate.