No, it is highly unlikely that life on earth would cease to exist. There are too many places where extremophiles or other similar creatures are surviving beyond

No, it is highly unlikely that life on earth would cease to exist. There are too many places where extremophiles or other similar creatures are surviving beyond the reach of nuclear radiation, fallout or nuclear winter; * We have found caves that have been closed off for millions of years, there might be more * Extremophiles are living around thermal vents at the sea floor * In the Russian Permafrost, Microbes have been found in suspended hibernation since a couple million years ago In general, even if we were to nuke this dirtball to shit and back, something would be likely to survive