How Many Ways Can the Sun Kill Us?

The dinosaurs knew a smaller, dimmer sun than we do today. And we’re in the last legs of the viability of life on Earth. In about 500 million years, our sun will brighten to the point that it will trigger a runaway greenhouse effect on the Earth. The oceans will evaporate, locking in more heat in the atmosphere, which will cause even more evaporation, which will heat up the planet more, leading to an out-of-control feedback loop. While today, we know our parent star as the source of light