1.   A NASA spacecraft on a seven-year mission to collect comet dust survived a zap from an enormous solar flare this month.

2.   Comet dust falls harmlessly onto Earth all the time, scientists say.

3.   For scientists, even the tiniest bit of pure comet dust will be a bonanza.

4.   NASA launched the Stardust spacecraft on a mission to chase a comet in hopes of collecting a sample of comet dust.