Re: Holy ... !!
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CLICK THIS
Comet C/NEAT (2001 Q4)
Click the above, change the date to April 20, 2004, then step through the script one day at a time. Rotate the scene. Zoom in on Earth or the comet. It's currently below the Solar system, out between Jupiter and Saturn, but inbound. The orbit will bring it between Earth and Venus, and the tail will miss Earth by about 10 or so days, but it will definitely cross Earth's path in a likely (well, very hopefully) brilliant display.
Bookmarked,
Dan