Resumen de Mystery of 2km Antarctic ice circle solved
It is as mysterious as they come. A huge, 2-km-wide circle spotted during a routine flight over an Antarctic ice shelf in 2014 has had scientists scratching their heads ever since. Initially, they suspected a meteorite strike in 2004 had made the ice crater. But opinions changed when scientists first visited the circle on foot earlier this year. They found a 3-m-deep depression with raised edges and, in the centre, three moulins--vertical well-like shafts in the ice--with two meltwater streams flowing into them.
