Earth will become too hot to support liquid water



Robert Connon Smith : scientist
By 1,000,000,000 AD The Sun's luminosity is expected to have increased by 10%, causing Earth's surface temperatures to reach an average of 47°C.


http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2008.13022.x/abstract;jsessionid=902E16FE5F2854E72D67F4098FAE5BC2.d03t02