Ethan Siegel – Medium

Ethan Siegel

Published in

Starts With A Bang!

Ask Ethan: Does cosmic inflation violate energy conservation?

A few physical quantities, in all laboratory experiments, are always conserved: including energy. But for the entire Universe? Not so much.

16h ago

Ask Ethan: Does cosmic inflation violate energy conservation?

16h ago

Published in

Starts With A Bang!

How to understand the Universe’s the most important equation

If you want to understand the Universe, cosmologically, you just can’t do it without the Friedmann equation. With it, the cosmos is yours.

1d ago

How to understand the Universe’s the most important equation

1d ago

Published in

Starts With A Bang!

Uranus’s moons are darkened on one side, Hubble reveals

Viewing Uranus’s largest moons with Hubble, astronomers hoped to find darkening on the trailing side. They found the exact opposite…

2d ago

Uranus’s moons are darkened on one side, Hubble reveals

2d ago

Published in

Starts With A Bang!

Astronomers close in on the source of the highest energy particles

On Earth, our particle accelerators can reach tera-electron-volt (TeV) energies. Particles from space are thousands of times as energetic.

3d ago

Astronomers close in on the source of the highest energy particles

3d ago

Published in

Starts With A Bang!

JWST reveals that galaxies grow up quickly in our Universe

The first galaxies were irregular blobs of gas and stars. But modern features, like spiral arms and bars, appeared earlier than expected.

4d ago

JWST reveals that galaxies grow up quickly in our Universe

4d ago

Published in

Starts With A Bang!

Ask Ethan: What are the “first stars” in the Universe?

If the Universe is 13.8 billion years old today, but different ages the farther we look back, what does it mean for a star to be the first?

Jun 13

Ask Ethan: What are the “first stars” in the Universe?

Jun 13

Published in

Starts With A Bang!

780,000 galaxies revealed in JWST’s largest science operation

The COSMOS-Web has just finalized their release of their full field: larger and deeper than any other JWST program. Here’s what’s inside.

Jun 12

780,000 galaxies revealed in JWST’s largest science operation

Jun 12

Published in

Starts With A Bang!

Anomaly no more! “Muon g-2” puzzle resolved at last

When theory and experiment disagree, it could mean new physics. This time, they solved the muon g-2 puzzle, and saved the Standard Model.

Jun 11

Anomaly no more! “Muon g-2” puzzle resolved at last

Jun 11

Published in

Starts With A Bang!

How the Milky Way-Andromeda merger became so uncertain

For decades, astronomers have claimed the Milky Way will merge with Andromeda in ~4 billion years. Here’s why, in 2025, that seems…

Jun 10

How the Milky Way-Andromeda merger became so uncertain

Jun 10

Published in

Starts With A Bang!

10 quotes about science’s value to society

As US science faces record cuts to funding, jobs, and facilities, these 10 quotes help remind us how science brings value to us all.

Jun 9

10 quotes about science’s value to society

Jun 9

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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