In about seven and a half billion years, the Earth will lose its orbital energy and drop into the path of the sun, putting an end to our little planet’s life. But what if this happened next month? “Because of an accident within the gravitational system,” C.F. Ramuz coolly informs us on the second page of Into the Sun, his 1922 novel of fiery apocalypse, “The Earth is rapidly plunging into the sun.” In case you weren’t sure what that means for us, Ramuz minces no words about our ul...