Tell me about comets

• The comet Haley's nucleus is like a potato with dimensions of 15 km long and 10 km wide.


• The soviet spacecraft vega 2 traveled through the comet's coma, within 8000 km of the nucleus.


• It orbits around the sun in 76 years.


• The well developed tail structure of the comet was captured in a image on March 5, 1986


• The head of the comet is much smaller than Earth.