Resumen de Cranky young sun could have kickstarted life
Giant flare-ups from the young sun might have kept early Earth warm--and any life nicely fertilized. About 4 billion years ago, the sun was only 70% as bright as it is today, which should have made the Earth a frozen snowball. But geological evidence shows the planet was warm enough at that time for liquid water. Now, Vladimir Airapetian of NASA's Goddard Space Flight Center in Maryland suggests that the young sun, though weak, was hyperactive, sending blasts of prawns streaming across space to help warm the planets.
