A meteorite that is one of the biggest pieces of the moon ever put up for sale is being auctioned online by a Boston based firm.

The moon rock, weighing about 5.5kg was found last year in a remote area of Mauritania.

It is thought to have plunged to earth thousands of years ago.

Its large size and composition are very unusual. It could fetch around $0.5m (£380,000) at auction.