Today marks the Vernal Equinox , the first day of Spring for planet Earth's northern hemisphere. No, but the Earth has made similar journeys in the past. In fact, tales are often told of our planet's 1910 passage through comet Halley's tail. Anticipation of this event caused hysteria as it followed close on the heels of the spectroscopic detection of CN , poisonous cyanide, as a gaseous constituent of cometary tails . However, stretching for millions of miles, awe-inspiring comet tails are actually an extremely tenuous, nearly perfect vacuum and don't pose a danger to life on Earth .
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