Why it’s taking a century to pin down the speed of the universe

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

If you look up on a clear night, chances are you’ll be able to identify the constellation Orion, most likely from the line of three stars that form its belt. These are, from left…