Brines (IMAGE) University of Copenhagen - Niels Bohr Institute Caption The red line on the left shows the sunrise and the right is the sunset. When night falls, some of the water vapor in the atmosphere condenses on the planetary surface as frost, but perchlorates are very absorbent and it forms a brine, which is liquid. The light blue dots show when a brine with calcium perchlorate is liquid at the surface and the dark blue dots show when it is liquid five centimeters below the surface. Credit (Credit: Javier Martin-Torres et al.) Usage Restrictions (Credit: Javier Martin-Torres et al.) License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.