5. Solar Superflare
A solar superflare is an eruption on the Sun far more powerful than any in recorded history. If our star unleashed such a burst, the resulting radiation could devastate Earth’s atmosphere, frying electronics and possibly even stripping away the ozone layer. Scientists have observed superflares on other stars, sparking ongoing research—like that cited by NASA’s solar activity studies—to understand whether our Sun could someday unleash a similar catastrophe.