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25 year update on the “Millennium problems” in physics

25 year update on the “Millennium problems” in physics

In the year 2000, physicists created a list of the ten most important unsolved problems in their field. 25 years later, here’s where we…
Go to the profile of Ethan Siegel
Ethan Siegel
How far back in time can we see in space?

How far back in time can we see in space?

We see objects whose light only arrives just now. But we see them as they were in the past: when that now-arriving light was first emitted.
Go to the profile of Ethan Siegel
Ethan Siegel
Ask Ethan: Can a lumpy Universe explain dark energy?

Ask Ethan: Can a lumpy Universe explain dark energy?

Our Universe isn’t just expanding, the expansion is accelerating. Instead of dark energy, could a “lumpy” Universe be at fault?
Go to the profile of Ethan Siegel
Ethan Siegel
The quantum reason that explains why the Sun shines

The quantum reason that explains why the Sun shines

Despite the Sun’s high core temperatures, atomic nuclei repel each other too strongly to fuse together. Good thing for quantum physics!
Go to the profile of Ethan Siegel
Ethan Siegel
The one-page calendar that changes how you view the year

The one-page calendar that changes how you view the year

It’s simpler, more compact, and reusable from year-to-year in a way that no other calendar is. Here’s both how it works and how to use it.
Go to the profile of Ethan Siegel
Ethan Siegel
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