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How the cosmic microwave background proves the Big Bang
How the cosmic microwave background proves the Big Bang
In the 20th century, many options abounded as to our cosmic origins. Today, only the Big Bang survives, thanks to this critical evidence.
Ethan Siegel
May 3
The better way to measure cosmic time
The better way to measure cosmic time
For some reason, when we talk about the age of stars, galaxies, and the Universe, we use “years” to measure time. Can we do better?
Ethan Siegel
May 2
The Universe might never run out of hydrogen
The Universe might never run out of hydrogen
The most common element in the Universe, vital for forming new stars, is hydrogen. But there’s a finite amount of it; what if we run out?
Ethan Siegel
May 1
The unsurprising non-detection of intelligent aliens
The unsurprising non-detection of intelligent aliens
Life arose on Earth very early on. After a few billion years, here we are: intelligent and technologically advanced. Where’s everyone else?
Ethan Siegel
Apr 30
If photons have mass, could they explain dark matter?
If photons have mass, could they explain dark matter?
Our Universe requires dark matter in order to make sense of things, astrophysically. Could massive photons do the trick?
Ethan Siegel
Apr 29
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