Space
The Hubble constant, a set number that connects a galaxy’s speed to its distance from Earth and tells us how fast the universe is expanding, was first described more than a hundred years ago – but astronomers have debated it ever since
By Jim Baggott
This Hubble Space Telescope image is cluttered with myriad galaxies
NASA, ESA, B. Sunnquist, J. Mack, J. Lotz (STScI), HFF Team
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…
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