illectro writes: This amazing video takes the last 30 years of asteroid discoveries and compresses it into just over 3 minutes, watch in fascination as astronomers discover that the solar system is a lot less empty than they originally thought. It's pretty cool to see how planetary alignment is a hugely important factor in discovering asteroids, before the arrival of digital imaging large numbers of asteroids were discovered when looking for moons around outer planets. If an asteroid is arriving from a direction close to the sun this video makes it clear that we'd have a hard time discovering it until it's passed the Earth, or worse, catastrophicly blindsides us.
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