Estimates state that the damage would have been close to $3 trillion, with a recovery time of up to ten years, with many pointing to the 1859 Carrington Event, a real-life worst-case scenario, as an example. Even in those nascent days of electricity, a direct hit from a solar storm was crippling. Telegraph machines, rapidly becoming the primary method of communication at the time, burst into flames across the country, burning the hands of operators and halting the messaging system for days.

On the plus side, though, people as far south as Cuba were said to have been able to read newspapers by the light of the aurora borealis it created, so at least we'd have that going for us.

Related: 6 Horrible Historical Disasters (We Actually Saw Coming)

Case in point: the ExxonMobil refinery in Torrance, California, just south of Los Angeles. In 2015, the refinery caught fire, as per routine, but then, in a stunning turn of events that absolutely no one could have foreseen, it fucking exploded. A five-story processing unit up and went kaboom, starting more fires, raining chemical ash like snow for miles, and sending a 40-ton piece of machinery flying across the industrial plant. The detonation was so big that it actually registered as a small earthquake. Remarkably, only four people were injured. But hundreds of thousands almost died horribly.

You see, had that 40-ton piece of industrial equipment exploded in a slightly different direction -- literally just a few feet to one side -- a tank containing massive quantities of hydrofluoric acid would have also exploded, releasing a cloud of poison gas with the potential to severely ruin everyone in a four-mile radius. A four-mile radius that included a bunch of residential neighborhoods, full of innocent bystanders and children and puppies and, OK, statistically probably one or two people who deserved it.

While no one knows for sure exactly how bad it would have been. We do know that gaseous hydrofluoric acid is toxic as shit, and has been known to corrode bone, burn skin, and cause lasting lung damage, or just straight up murder you. And as anyone who's ever been downwind of their roommate on chili night already knows, it's not exactly easy to stop a gas from spreading. Hence the Chemical Safety Board brushing their teeth and struggling into a pair of pants to tell ExxonMobil to get their act together. Speaking of floating clouds of poison and neighborhoods full of innocents ...

Related: 6 Natural Disasters That Were Caused By Human Stupidity

In late June 1993, residents near Aum Shinrikyo's headquarters -- an utterly nondescript office building in an eastern area of Tokyo, and not, like, a giant skull-shaped island -- complained to local authorities about foul odors coming from the building. A few days later, the stink was accompanied by loud banging and a weird mist coming from the roof, and then that afternoon, by a black "gelatin-like" ooze creeping down the side of the building. Finally, on July 2, after the misting and ooze had continued unabated for at least two days, authorities politely asked the doomsday cult to vacate the building so they could investigate.

The cult complied, but investigators didn't get inside for another two weeks, at which point the building had been cleaned out, save for some black stains on the walls. The police took a few samples, but didn't bother to actually test them. And so, with little more than a series of halfhearted shrugs, authorities promptly forgot about the entire thing.

Fast-forward to 1995, when that cult tried to murder an entire subway system's worth of people. Someone involved in that investigation remembered the weird mist incident from earlier, and since they had a bunch of Aum Shinrikyo's goons and scientist-goons in custody, they finally asked them what was up. Anthrax was what was up. Aum Shinrikyo had successfully anthraxed Tokyo.

The only reason this didn't go down as a history-changing bioweapon attack is that the cult had accidentally released a strain of anthrax used for vaccines instead of a more murderous version. Reportedly, a few birds and pets died, but that apparently hadn't raised enough flags. But, again, neither had a doomsday cult's headquarters leaking black ooze, so what're you gonna do?

As for how many could have died, that's impossible to say. There were 7,000 people in the "high risk" zone, but who knows exactly how far a lethal strain would have spread. It would have come down to their spraying equipment, the viscosity of the compound, the weather/wind, and other factors we don't know because this exact thing has never happened before. For instance, if the first release had immediately worked, how many additional attacks could they have gotten in before somebody finally arrested them? Authorities seemed to have these guys on a pretty long leash.

Related: 6 Horrifying Disasters Conveniently Edited Out Of History

Many engineers were quick to point out that, had the reservoir's levels been where they were supposed to be -- and where they actually were only a year earlier -- more than 100,000 residents of the San Fernando Valley would have been straight-up killed. Once even a little bit of water started to spill from the dam, there would have been nothing they could done to stop all of it from following, and there would have been nothing anyone anywhere could have done to avoid it once that flood started.

As it was, engineers evacuated close to 80,000 people for three days and began draining the reservoir almost immediately, fearing that an aftershock would set their worst-case scenario in motion. All of them probably greeted the rising sun with a smile, appreciating that they had been granted a new lease on life, feeling like every new day would be a precious gift. Then that feeling probably went away by Day 2.

Related: 5 Apocalypse Scenarios You Should Stop Worrying About

And in 1883, we very nearly had whole bunch of them all at once.

Mexican astronomer Jose Bonilla, doing what astronomers do, was looking through his telescope in August 1883 when he saw approximately 450 fuzzy objects passing between Earth and the sun. Not entirely sure what it was, but assuming the phenomena was, like, something, Bonilla dutifully published his report in the French journal L'Astronomie, complete with old-timey photos. But because proper science hadn't been invented yet, his contemporaries wrote the whole thing off, claiming that Bonilla had simply seen a flock of geese or forgotten to clean his telescope lens.

Fast-forward 130 years, and a different set of Mexican astronomers have finally figured out what Bonilla was looking at: the Earth's narrowly avoided obliteration. They figured out that the "450 fuzzy objects" were in fact pieces of a broken comet, all passing within a few thousand kilometers of earth -- an astronomical "hair's breadth." By their estimates, there were a total of over 3,000 objects skirting past our orbit, each one at least the size of the asteroid that blew up Russia.

If even a couple of them had been just a little bit closer, we'd have had a full-on extinction event on our hands. And our only reaction was to tell a guy to clean his filthy telescope.

Eirik Gumeny has written about at least two of these things actually (fictionally) happening in his Exponential Apocalypse series, because he is a bucket of rainbows and sunshine. There's a lot more farting in cars than actual science in the books, but he thinks you'd like them anyway. You can also follow him on Twitter, if that's a thing you do.

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