Ethan Siegel – Medium

Ethan Siegel

Published in

Ask Ethan: Can Weber bars detect gravitational waves?

We’ve now detected hundreds of gravitational waves with LIGO, Virgo, and KAGRA. What if we tried Weber’s original method in the modern day?

20h ago

Ask Ethan: Can Weber bars detect gravitational waves?

20h ago

Published in

Our first terraforming goal should be the Moon, not Mars

The first world beyond Earth for human habitability should be the Moon, not Mars. This is why we should terraform our lunar neighbor first.

1d ago

Our first terraforming goal should be the Moon, not Mars

1d ago

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How to understand Einstein’s relativity without math

Times dilate and lengths contract near the speed of light. Bizarre and confusing? Sure. But under relativity, it can’t be any other way.

2d ago

How to understand Einstein’s relativity without math

2d ago

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Astounding stream of stars caught escaping from nearby galaxy

Stellar streams are faint trails of stars that appear to “stream” out of galaxies. A new one, escaping galaxy M61, may point to many…

3d ago

Astounding stream of stars caught escaping from nearby galaxy

3d ago

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The Red Spider Nebula gets its JWST glow-up

When dying, Sun-like stars have binary companions, spectacular sights arise from the ionization. JWST spots the Red Spider Nebula in…

4d ago

The Red Spider Nebula gets its JWST glow-up

4d ago

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Ask Ethan: Could evolving dark energy lead to a Big Crunch?

There’s some, but not overwhelming, evidence that dark energy is evolving. What would it take for a “Big Crunch” to be our cosmic fate?

Nov 7

Ask Ethan: Could evolving dark energy lead to a Big Crunch?

Nov 7

Published in

Groupthink in science isn’t a problem; it’s a myth

Scientists are notoriously resistant to new ideas. Are they falling prey to groupthink? Or are our current theories just that successful?

Nov 6

Groupthink in science isn’t a problem; it’s a myth

Nov 6

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Why aliens might not “speak physics” the same way we do

Physicist Daniel Whiteson challenges the notion that all intelligent species would eventually uncover the same laws of nature. Do you…

Nov 5

Why aliens might not “speak physics” the same way we do

Nov 5

Published in

Neutrinos are still the most mysterious particle we know of

Nearly 100 years after being theorized, the strange behavior of the neutrino still mystifies us. They could be even stranger than we know.

Nov 4

Neutrinos are still the most mysterious particle we know of

Nov 4

Published in

Where does the expanding Universe begin?

The planet, the Solar System, and the galaxy aren’t expanding. But the whole Universe is. So where does the dividing line begin?

Nov 3

Where does the expanding Universe begin?

Nov 3

Ethan Siegel

Ethan Siegel

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

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