Check out this still-unexplained phenomenon over Norway:

Click the image to see the UK news story.

This amazing light-show started as the spiraling green beam, then grew to fill the sky with the giant spiral. Whoah! First assumption was a Russian rocket test, but the Russians deny that they launched at that time. What's it look like to you? Another photo:

Click the image to see another story.

There are plenty of sources, so it's verified, not a Photoshop job. Heck, there's even a video of the spiral forming.

Welcome, Alien Overlords!

Thanks for the heads-up, normalcyispasse!