He had another chance from 12 feet at the first play-off hole but the putt slipped past the left edge of the hole.

BBC: SPORT | Golf | Casey claims China play-off win

And the hole's outer edge is roughly where rocky planets, like the inner planets of this solar system (including the earth), are expected to be.

ECONOMIST: Dusty genesis

Els makes the green in two, but is forced to settle for a par-four and the half point when his 15-foot putt runs along the edge of hole.

BBC: Sunday at Wentworth

But Cyril merely observed that his sister must have gone off her nut, and he and Robert dug with spades while Anthea sat on the edge of the hole, jumping up and down with hotness and anxiety.

NPR: Excerpt: 'Five Children and It'

The Boston University team say the streams originate in the magnetic field near the edge of the black hole.

BBC: Black holes reveal more secrets

Colin Montgomerie carded his third successive round of 72, leaving a putt for par on the edge of his final hole, but made the cut by a solitary shot at level par.

BBC: Lee Westwood moves into contention at Dunhill Links

On the 18th hole, Guan stood over his 12-foot putt from the fringe and rolled it perfectly to the edge of the cup, then pumped his fist as it dropped into the hole.

WSJ: Guan Tianlang: A Schoolboy Steals Day One of the Masters

At the edge of his tree line is a forbidding 4-foot hole in the ground.

FORBES: Magazine Article

Its event horizon, the outer edge inside which not even light can escape from the black hole's gravitational pull, would be only about 7.5 million kilometres.

BBC: By BBC News Online Science Editor Dr David Whitehouse