Friday, November 30, 2012

Halley's Comet

The Halley's comet is a comet which orbits elliptically around the sun and approaches to Earth every 76 years. It consists of water ice and stony minerals, with a nucleus measuring 5 x 10 miles. It was named after the British astronomer Edmund Halley who watched and studied it in 1682, predicting its return. The last time it was observed from Earth was in 1986.