Comet Halley in 1910NASA
This historic photograph shows a wide-angle view of Halley's Comet as it appeared over Flagstaff, Arizona on May 13, 1910. The streaks at lower left are the city lights of Flagstaff, and the large bright object below the comet is the planet Venus. The best known of all comets, Halley orbits the Sun, and travels close enough to be seen from the Earth approximately once every 75 years. Its appearances have been recorded at least 30 times over the past 2000 years, and scientists have accurately predicted its return starting with its appearance in 1758.