PUBLIC MARKS from adfunk with tags rain & research

In this photo released by the Australian Antarctic Division, the rare and spectacular nacreous cloud (top) is seen high in the stratosphere some 20 kilometers (12 miles) above Australia’s Mawson station in Antartica, on July 25, 2006. The extremely cold temperatures below minus 85 degrees Celcius (minus 121 degrees fahrenheit) in the rarefied atmosphere show delicate Mother-of-Pearl shell colours produced when the fading light of the Antarctic sunset passed through tiny water-ice crystals blown along on a strong jet of stratospheric air.