http://ca.news.yahoo.com/s/afp/08022...ronomy_offbeat
http://uk.arxiv.org/
Within 7.6 billion years, Earth will be uninhabitable (actually probably within 2 billion years). This agrees with the New City on the New Earth (Rev. 21) which will be future Mars. Just ask yourself how long it takes to reach the nearest habitable planet and all you are left with is Mars.
