Over two billion years from now, Earth will no longer be able to sustain life. A new study looks at how much life has ever existed and what this means for the discovery of new life-supporting planets.
Quentin Wheeler, State University of New York College of Environmental Science and Forestry; Antonio G. Valdecasas, Consejo Superior de Investigaciones Científicas (CSIC), and Cristina Cánovas, Consejo Superior de Investigaciones Científicas (CSIC)
If you go by editorial cartoons and T-shirts, you might have the impression that evolution proceeds as an orderly march toward a preordained finish line. But that’s not right at all.
Humans play host to many little passengers. Right now, you’re incubating, shedding or have already been colonised by viral, bacterial, parasitic or fungal microorganisms - perhaps even all of them.