Every few months they adjust the orbit to remain a safe distance away from a known piece of debris," he said.

It is the oldest known piece of portable art from Wales.

He is credited with creating the first known piece of European music for three voices.

Her catalogue raisonné, published in 1995 by Abrams, lists only 599 known pieces.

It is a pasodoble and one of the better known pieces of Spanish music around the world.

The first known piece of music to be written down was Hurrian.

It is probable that there are not over 100 known pieces, probably fewer.

The missing bones were created using known pieces from close relatives of Brontosaurus.

One of his better known pieces is the Istrian Suite which he wrote in 1946.

Op art works are abstract, with many of the better known pieces made in only black and white.