Today's theme is defending the planet. We earthlings are pretty proud of our armaments. But would we be able to defend ourselves against extraterrestrial threats?

We've had some close calls already.

Foreign Policy takes stock of the Pentagon's planetary defenses.

We're still just digging into our home territory. Our rovers on Mars are picking up creepy shadows.

Our plans to send people to Venus haven't panned out.

But our latest moon missions are running ahead of schedule. Will we spot threats in our solar system in time?

Well, we'd better look harder. Here's a video of a two-meter chunk of asteroid blowing up in our atmosphere just a few weeks ago. Close call!

It's all a moot point anyway, of course. Our galaxy will collide with its neighbor in 4 billion years, and that will be all, folks.

Image via Shutterstock

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