For an asteroid to wipe out humans, it has to be bigger than the one that killed the dinosaurs
- For an asteroid to actually destroy life on Earth, it will have to be bigger than the one that caused the dinosaurs to go extinct.
- The fact that humans are smarter gives them an edge over the dinosaurs when it comes to detecting and avoiding extinction level events — like an asteroid impact.
- It would still be a set back for human history where people would either have to hide deep underground or survive eating shellfish.
"In the order of things people should be worried about,
"But it does have the potential to be the most devastating natural disaster known to man," explains Johnson.
And, it's only a matter of time.
"It's a 100% certain that we're going to get hit, but we're not 100% certain when," B612 President Danica Remy told NBC.
Humans survived when the Sun was blocked out
There is evidence that a kilometer long asteroid crashed into Southeast Asia around 800,000 years ago — and our ancestors had survived it.
The asteroid did impact human evolution and blocked out the Sun for years with the dust it threw up. Yet, humanity was not wiped out.
Scientists are yet to determine exactly how humans managed to survive and they're hoping that finding the exact impact site of the crater will help.
Humans are smarter than dinosaurs
The fact that humans are smarter than dinosaurs gives them an edge when it comes to surviving an asteroid impact.
"So long as we retain at least stone age technology, there isn't much that could make us extinct," Robert Walker, a scientist and mathematician, told Science 2.0.
It's possible that humans would go back to beach-combing or surviving on shellfish but they would survive, according to Walker.
Another way to survive an asteroid impact would be to go deep underground to survive what would be a nuclear winter — similar to what follows a nuclear war, according to Elisabetta Peirazzo, a senior scientist at the Planetary Science Institute.
NASA is working on a mission to survive asteroids
As of now, there are a lot of asteroids whizzing past Earth — some of them a little too close to comfort — but none are on a direct collision course for the planet according to NASA's Planetary Defence Coordination Office (PDCO).
If an asteroid were to shift its course, space agencies have telescopes on ground and in space, keeping an eye out.
NASA is currently working on its Double Asteroid Redirection Test (DART) Mission to defend the planet against any extinction level asteroids that might come its way.
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