CNN  —  The world’s largest iceberg is on the move again, drifting through the Southern Ocean after months stuck spinning on the same spot, scientists from the British Antarctic Survey (BAS) have said. Spanning an area of 3,672 square kilometers (1,418-square-miles) when measured in August – slightly bigger than Rhode Island – the A23a iceberg has been carefully tracked by scientists ever since it calved from the Filchner-Ronne ice shelf in 1986. It remained grounded on the Antarctic’s Weddell