YouTube has fast become a place where people get their news, and in that vein, we re delighted to join the YouTube Space Lab channel with our new online series, The Countdown.

Every other Thursday, host and self-proclaimed web nerd Dave Mosher presents the five coolest things happening in space, astronomy and physics. Our first episode debuted July 26 and features a solution to a physics mystery related to the Pioneer spacecraft, contest-winning satellite imagery and seven minutes of terror on Mars.

Putting everything together behind-the-scenes are Scientific American video editor and producer Eric Olson and space/physics editor John Matson, along with YouTube producer Jake Roper.

Check out The Countdown videos at YouTube here.

You can also read The Countdown blog, which sums up each episode and has links for more information, and subscribe to the feed here.

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