Solar flares destroying power grids yes and pelting the Earth with city-sized fireballs? no Massive meteor showers? theoretically possible, has happened but none scheduled any time soon One huge meteor as big as Texas? there are asteroids approaching that size, but no Could there be a change in the composition of the sun resulting in massive overheating / supernovae or cooling off to a dim red? not within any even comprehensible amount of time (5 billion years) Rouge planet entering our solar system in near collision with the Earth? no. (Not only is rouge a color and not the word rogue, but there are almost certainly no wandering planets anywhere nearby, if there were, we’d see it coming for a ridiculous amount of time, and the odds of it coming near Earth are ridiculously low. What if the Earth’s core stops spinning and the Earth’s magnetic field disappears. When that happens, compasses will stop pointing north, birds will not know where to fly when they migrate, and the Earth’s atmosphere will disappear. LOL no. There is no reason why the planet would stop spinning suddenly enough to matter. It is slowing down, such that there were 40 more days per year… about 400 million years ago. Or, maybe humans lose the ability to reproduce Sure, maybe. We keep adding radiation, industrial food, water treatments, GMO foods laced with the pesticides they enable, microbeads and other industrial crap. Or maybe we get a pandemic that sterilizes us. That could help with our overpopulation and overexploitation problems. or some other animal or insect becomes the dominate species. (domi-nant) That could be a good thing, since we’re driving ourselves and way too many other species to extinction. But unless you mean a species of disease and/or insect, or after we mostly die off due to our utterly foolish environmental abuses, this seems very unlikely without an imaginative SF cause. Or some horrific pandemic kills large amounts of life. Quite possible. It’s ironic that you think of all of these causes, but don’t mention the actual ones that are happening and may wipe out life on our planet as we know it, including ourselves: catastrophic climate change rapid human-caused extinctions leading to ecosystem collapse food supply failures due to risks from excessive industrial food production and GMO monocultures, dying bee populations, etc food supply failures due to catastrophic overfishing, ocean acidification, pollution, climate change, etc modern warfare including nuclear, biological, chemical, space-based kinetic weapons, automated weapon systems, etc