How the scorching sun near Mercury may help the planet make ice (video) Georgia Institute of Technology Share Print E-Mail Loading video... Caption There's ice on Mercury, where daytime temperatures reach 400 degrees Celsius, or 750 degrees Fahrenheit. A new study says that the Vulcan heat on the planet closest to the sun likely helps make some of that ice. Credit NASA / Georgia Tech / Guberman / Brumfield Usage Restrictions None Share Print E-Mail 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.