Halley's Comet Photograph by James Balog Of the thousands of known comets in the solar system, Halley's comet is one of some 200 that are periodic. Halley's comet orbits Earth every 76 years; the next flyby will occur in 2061.
Nick Crane "there IS somebody out there!" ~ 11/21/13 Today I'm grateful for books on the constellations and resources that I can use to teach my children about them. We've really enjoyed our study on the stars!