Springtime Comet Fever . ... AAC Explanation: Today marks the Vernal Equinox , the first day of Spring for planet Earth's northern hemisphere. ... Gorgeous pictures of the comet with its delightful tails - this one taken March 16 - make this outbreak of "comet fever" understandable. Will the Earth pass through the lovely tails of Hale-Bopp ? ... In fact, tales are often told of our planet's 1910 passage through comet Halley's tail. ... NASA Web Site Statements, Warnings, and Disclaimers . ...