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There are more galaxies in the Universe than even Carl Sagan ever imagined

There are more galaxies in the Universe than even Carl Sagan ever imagined

Forget billions and billions. When it comes to the number of galaxies in the Universe, both theorists’ and observers’ estimates are too…
Go to the profile of Ethan Siegel
Ethan Siegel
NASA’s super-Hubble to finally find inhabited planets

NASA’s super-Hubble to finally find inhabited planets

There are billions of potentially inhabited planets in the Milky Way alone. Here’s how NASA will at last discover and measure them.
Go to the profile of Ethan Siegel
Ethan Siegel
One shocking fact about each and every planet in the Solar System

One shocking fact about each and every planet in the Solar System

Do you think you know the Solar System? Here’s a fact about each planet that might surprise you when you see it!
Go to the profile of Ethan Siegel
Ethan Siegel
Ask Ethan: Why do black holes look like rings, not disks?

Ask Ethan: Why do black holes look like rings, not disks?

With two different black hole event horizons now directly imaged, we can see that they are, in fact, rings, not disks. But why?
Go to the profile of Ethan Siegel
Ethan Siegel
Star-formation is truly unstoppable, even with the strongest feedback

Star-formation is truly unstoppable, even with the strongest feedback

When stars form, they emit energetic radiation that boils gas away. But it can’t stop gravitational collapse from making even newer stars.
Go to the profile of Ethan Siegel
Ethan Siegel
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