Every now and again, you'll read a science story claiming the "best picture of dark matter" ever. If it's so dark, how can you see it? In this week's "Ask a Physicist", we'll find out.
I've talked a lot about dark matter in previous columns, but did you know it's "Dark Matter Awareness Week?" Of course you did. I'll celebrate by answering a question put to me by our own Charlie Jane Anders, who asks: