Looking at the title of this blog, how long can we live without the Sun? And what would happen if there was no sun? In about a week, the global temperature would drop to below 0. Some microorganisms would live, but most life on Earth would die. Plants would die off immediately, but large trees would stay awhile. The top of the oceans would freeze but below would stay insulated and not freezing for many years to come. So, theoretically, we could live in submarines in the lowest part of the oceans. But we could also make a nuclear or geothermal habitat to live on. Looking at if the Sun were to just disappear, since our sun keeps us in revolution, the Earth would literally spin off and just let go of orbit.