disk

Martin has a squashed disk in her spine and finds the waterbed is easier on her hips.

The researchers led by Northwestern University's Nick Kaaz, a graduate student in astronomy, used computer simulations to determine that the black hole causes rotations which warp the accretion disk in such a way that the gas actually starts caving in on itself.

Eventually the entire accretion disk is torn in half, with the black hole first consuming the inner disc and then the outer one.

But Akinkunmi’s was a simple affair, with equal green-white-green vertical stripes - and it replaced the colonial flag that had included the British union jack and a six-pointed green star under a red disk.

Mr Richards wants people to stop buying the plastic rings and to use the "solid traditional disk frisbee instead".