Sometimes the universe is just too complicated to analyze. Heck, if you take a tennis ball and toss it across the room, even that is practically too complicated. After it leaves your hand, the ball ...

Time is a straightforward concept - or is it? The passing of minutes and years isn't as easy to explain as many assume.

The following is an extract from our Lost in Space-Time newsletter. Each month, we hand over the keyboard to a physicist or two to tell you about fascinating ideas from their corner of the universe.

The best online physics courses allow you to start learning from the top schools and thinkers – and Black Friday is a great time to sign up. When you purchase through links on our site, we may earn an ...