Ethan Siegel – Medium

Ethan Siegel

Ethan Siegel
in
Starts With A Bang!

Ask Ethan: Why are inertial and gravitational mass equivalent?

The mass that gravitates and the mass that resists motion are, somehow, the same mass. But even Einstein didn’t know why this is so.

1d ago

Ask Ethan: Why are inertial and gravitational mass equivalent?

1d ago

Ethan Siegel
in
Starts With A Bang!

What do unexpected experimental results actually tell us?

Scientific surprises, driven by experiment, are often how science advances. But more often than not, they’re just bad science.

2d ago

What do unexpected experimental results actually tell us?

2d ago

Ethan Siegel
in
Starts With A Bang!

Official verdict: JWST’s early galaxies didn’t break cosmology

The “little red dots” were touted as being too massive, too early, for cosmology to explain. With new knowledge, everything adds up.

3d ago

Official verdict: JWST’s early galaxies didn’t break cosmology

3d ago

Ethan Siegel
in
Starts With A Bang!

It’s important that weight and mass are not the same

Here on Earth, we commonly use terms like weight (in pounds) and mass (in kilograms) as though they’re interchangeable. They’re not.

4d ago

It’s important that weight and mass are not the same

4d ago

Ethan Siegel
in
Starts With A Bang!

7 unnecessary assumptions about life in the Universe

So far, Earth is the only planet that we’re certain possesses active life processes. Here’s what we shouldn’t assume about life elsewhere.

5d ago

7 unnecessary assumptions about life in the Universe

5d ago

Ethan Siegel
in
Starts With A Bang!

Ask Ethan: Why don’t we feel the Universe’s expansion accelerating?

The Universe isn’t just expansion, but the expansion itself is accelerating. So why can’t we feel it in any measurable way?

Aug 30

Ask Ethan: Why don’t we feel the Universe’s expansion accelerating?

Aug 30

Ethan Siegel
in
Starts With A Bang!

What is the origin of quantum uncertainty?

No matter how good our measurement devices get, certain quantum properties always possess an inherent uncertainty. Can we figure out why?

Aug 29

What is the origin of quantum uncertainty?

Aug 29

Ethan Siegel
in
Starts With A Bang!

Why haven’t we detected a signal from intelligent aliens yet?

Life arose on Earth early on, eventually giving rise to us: intelligent and technologically advanced. “First contact” still remains…

Aug 28

Why haven’t we detected a signal from intelligent aliens yet?

Aug 28

Ethan Siegel
in
Starts With A Bang!

How far away are we from the location of the Big Bang?

If you think of the Big Bang as an explosion, we can trace it back to a single point-of-origin. But what if it happened everywhere at once?

Aug 27

How far away are we from the location of the Big Bang?

Aug 27

Ethan Siegel
in
Starts With A Bang!

Why do we count the Universe’s age from 13.8 billion years ago?

The Universe is 13.8 billion years old, going back to the hot Big Bang. But was that truly the beginning, and is that truly its age?

Aug 26

Why do we count the Universe’s age from 13.8 billion years ago?

Aug 26

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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