Why did the Universe start off with Hydrogen, Helium, and not much else?

Where the first atoms in the Universe — the progenitors of all the normal matter that makes up everything we know — came from.

Ethan Siegel
Starts With A Bang!

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“I see a lot of new faces. But, you know the old saying, ‘out with the old, in with the nucleus.’” -The Simpsons

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Ethan Siegel
Starts With A Bang!

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.