great comet

Noun

 * 1)  A period of cometary activity when the comet becomes exceptionally bright.

Hyponyms

 * Great Comet of 2007 first great comet of 21st century
 * Great Comet of 1997 last great comet of 20th century
 * Great Comet of 1996 first great comet in two decades
 * Great Comet of 1976 brightest comet in half-a-century
 * 1910 Halley's Comet second great comet of 1910