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Ethan Siegel

Published in

Starts With A Bang!

11 NASA astrophysics missions face risk of cancellation

NASA astrophysics, which gave us Hubble, JWST, and so much more, faces its greatest budget cut in history. All future missions are at risk.

17h ago

11 NASA astrophysics missions face risk of cancellation

17h ago

Published in

Starts With A Bang!

Starts With A Bang podcast #117 — Gravitational waves and the Universe

Just 10 years ago, humanity had never directly detected a single gravitational wave. We’re closing in on 300 now, with so much more to…

2d ago

Starts With A Bang podcast #117 — Gravitational waves and the Universe

2d ago

Published in

Starts With A Bang!

Ask Ethan: Has the USA become a fascist nation in 2025?

Fascism was a powerful, evil force in the 20th century, notably in Italy, Germany, and Spain. Is the USA repeating history here in 2025?

3d ago

Ask Ethan: Has the USA become a fascist nation in 2025?

3d ago

Published in

Starts With A Bang!

The Universe is not symmetric

The laws of physics obey certain symmetries and defy others. It’s theoretically tempting to add new ones, but reality doesn’t agree.

4d ago

The Universe is not symmetric

4d ago

Published in

Starts With A Bang!

What to know about vaccines in the do-your-own-research era

For centuries, vaccines have been the top life-saving, expert medical intervention known to humans. How can individuals make the right…

5d ago

What to know about vaccines in the do-your-own-research era

5d ago

Published in

Starts With A Bang!

The most “boring” part of cosmic history shaped our modern Universe

It took nearly 400,000 years, after the Big Bang, to first form neutral atoms. The imprints from that early time can now be seen…

6d ago

The most “boring” part of cosmic history shaped our modern Universe

6d ago

Published in

Starts With A Bang!

JWST’s most ambitious view is now available to everyone

The COSMOS-Web survey is now complete, combining JWST and Hubble infrared data. Its spectacular views show us the Universe as never before.

May 12

JWST’s most ambitious view is now available to everyone

May 12

Published in

Starts With A Bang!

Ask Ethan: Is dark energy just leftover momentum from the Big Bang?

Since 1998, we’ve known our Universe isn’t just expanding, but the expansion is accelerating. Could the Big Bang itself be the reason why?

May 9

Ask Ethan: Is dark energy just leftover momentum from the Big Bang?

May 9

Published in

Starts With A Bang!

The six strongest materials on Earth are harder than diamonds

For millennia, diamonds were the hardest known material, but they only rank at #7 on the current list. Can you guess which material is #1?

May 8

The six strongest materials on Earth are harder than diamonds

May 8

Published in

Starts With A Bang!

This 1938 pro-science manifesto defended democracy against fascism

As democracy recedes and fascism rises in the USA and around the world in 2025, history provides a lesson in how science can fight fascism.

May 7

This 1938 pro-science manifesto defended democracy against fascism

May 7

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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