Ask a Physicist: Are we Surrounded by Dyson Spheres?

My latest “Ask a Physicist” column is up at io9. This week, I’ve got a mashup of extraterrestrials, dark matter, lensing, and Big Bang nucleosynthesis. The question is: “Are we surrounded by Dyson Spheres?” (A: no.)

If you’re checking out the blog for the first time be sure to click on the “physics” tag on the right for previous columns, random entries and the like, and of course, if you like this sort of thing then you may enjoy my book.

-Dave

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