Ethan Siegel

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


The Physics of the Death Star

How to destroy an Alderaan-sized planet.

“What’s that star?
It’s the Death Star.
What does it do?
It does Death. It does Death

The Most Wanted Particle

What the world’s most powerful collider found, and may yet still find.

“Innovation is taking two things that already exist and putting

Mostly Mute Monday: Volcanic Lightning

Lightning: it isn’t just for stormclouds.

“If you are caught on a golf course during a storm and are afraid of

Weekend Diversion: Why Cons Matter

If you ever loved something most people didn’t understand, you’ll get it.

“Most people are other people. Their thoughts are

Publications edited by Ethan Siegel

The Universe is out there, waiting for you to discover it.


Ask Ethan #81: Could you crawl out of a black hole?

Could a strong enough tether save you? Or is your fate inevitable?

“Nobody ever did, or ever will, escape the

Throwback Thursday: Past the Fingers of God

The Universe we see isn’t exactly the Universe that is. How do we translate?

“On a cosmic scale, our life is

Supertides are real!

The highest high tides occur once every 18 years, and can lead to surprising floods. Here’s the science behind them.

“But less intelligible still was

Could the LHC make an Earth-killing black hole?

Spoiler: NO, not a chance. Now find out why.

“There is, I believe, in every disposition a tendency to some

Mostly Mute Monday: Marvelous Mars

The highest-resolution panorama ever taken by a rover illuminates unprecedented detail of the red planet’s surface.

“Studying whether

Ask Ethan #80: Can space expand faster than the speed of light?

And if so, how does Einstein’s relativity — both special and general — cope?

“If everything seems…

Throwback Thursday: What is the Sun made of?

It’s the greatest source of energy in the Universe, and yet we had no idea until less than 100 years ago.