The Sun's luminosity has risen by 10%, causing Earth's surface temperatures to reach an average of c. 320 K (47 °C; 116 °F). The atmosphere will become a "moist greenhouse", resulting in a runaway evaporation of the oceans. As water evaporates from the Earth's surface, rocks harden, causing plate tectonics to slow and eventually stop. Pockets of liquid water may still be present at the poles or at high elevations, allowing small areas where life can survive. 1.3 Billion, Eukaryotic life dies out on Earth due to carbon dioxide starvation. Only prokaryotes remain. 1.5 to 1.6 Billion, The Sun's rising luminosity causes its circumstellar habitable zone to move outwards; as carbon dioxide rises in Mars's atmosphere, its surface temperature rises to levels akin to Earth during the ice age.