Can the human population go extinct if the biggest meteor hits Earth?

It sure can
Th Chixilub Impact was as wide as Los Angeles
Life survived, but changed forever
Mars sized Thiea landed where Canada is now 4.5 Billion years ago
It began Plate Tectonics and therefore eventually life, after the Late Heavy Bombardment 3.8 Billion years ago
life began in the depths of Mid Ocean Ridges and Faults that were forming
The Caledonian Canal in Scotland is the oldest Fault in the World and includes Loch Ness
I wonder what could really be lurking down there ?

Depending on the size of the meteor...yes it could.

Yes, a large meteor can cause all life on earth to be killed off.

All meteors hit Earth, by definition. If you meant to say 'meteoroid' or 'asteroid', then yes, the biggest known asteroids, Ceres, Pallas, and Vesta, would certainly destroy all surface life on the planet, if not all life altogether, but none of those are capable of striking Earth. A comet or asteroid strike by a 10 mile diameter object would destroy human civilization, though the species itself might survive the bottleneck.
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There are online calculators what will estimate damage from such impacts. There are many variables besides size, the composition of the object and the composition of the part of Earth it strikes, the angle of attack, its speed, etc. https://impact.ese.ic.ac.uk/ImpactEarth/ImpactEffects/
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Define "biggest."





For example:
A strike the size of the Chicxulub impact would not cause human extinction directly, because we have structures and subterranean areas that people can shelter in for the necessary duration. It would probably not cause extinction indirectly, because we have a number of protected seed banks to bring back agriculture afterward.

But it would certainly cause the collapse of technological civilization.
The question there is how bad that collapse would make things, and for how long.

An even larger impact? That's difficult to say.

A large enough asteroid or comet impacting the Earth would completely sterilize the planet, yes.

Not 'can' but very probably 'will'

If something that big whether a meteor or an asteroid strikes the Earth it will be just like the meteor which struck Earth and destroyed dinosaurs and everything except the smallest of creatures.

chelyabinsk had a 40 meter rock drop almost on top of them travelling at 30k/mph,it blew up bec internal heat owing to friction caused it to go boom,well before hitting ground,that thing shattered glass for a diameter of many miles,,,,a 400 meter rock out there can wipe out a county,a big city
one 50 miles across?as mr president said in armageddon where bruce willis saves the world,'fellow citizens,,we are facing an extinction event'
the rock or whatever it was that hit tunguska siberia in '08,,that could have wiped out any big city central district,
in a word,,,,, yes

It's very possible... Damage to the Earth could be great enough that we wouldn't survive.

of course

Yes, above a certain size and velocity and we could not survive, and it will eventually happen but probably not until after we're gone.

I heard - a meteorite only one kilometer in diameter can throw up so much dust it would obliterate the sun for a year or more and extinguish most life as we know it

If those meteors same big like this earth yes of course.

The dinosaurs? Even if you live past the blast, it’s going to block out the sun for a long *** time. Not sure how long, but I’ve heard stats that you are for sure for sure going to die. There will be no crops no food or anything it’ll all be frozen and lifeless.

At least the astronauts on board the ISS would survive for a couple of months.

It hypothetically *could*, but the truth is that the biggest meteors are also the rarest. It takes a lot to make life on Earth extinct, and remember that humans are only one out of millions of species. In the grand scheme of life on Earth we are actually insignificant, and transient anyway. Never in 400 million years has anything from space managed to send all life on Earth extinct. There is no indication of it happening at all.

The biggest existential risk to humans is humans themselves. Nothing to do with space. I don't want to rant about it, the message is already out there loud and clear, and has been for decades. But to summarize: we are sending ourselves to certain civilizational collapse and likely extinction within a century through the consequences of overpopulation and resource exhaustion.

Forget meteors and space. Learn the meaning of phrases like global war, civil war, overwhelming refugee crises, genocides on unprecedented scales, famines and plagues. We will soon be getting very familiar with those words.

Well it happened to the dinosaurs,so don't see why not.

No. It would need a large asteroid to cause significant damage.

yes. it can happen at any time and not just the biggest. Something about the size of a city should do the trick.

Yes.

The impact of a really big one could melt the Earth.

weel, if it is the biggest meteor with a high enough velocity, then yes, I would imagine that the entire human population could be wiped out.

Absolutely! Some are big enough to cause the earth's crust to melt into liquid and the temperatures would destroy all surface life. Life in the deepest places in the ocean may still exist afterwards.

Full species extinction? No--I think there will be survivors, but pity them--for they will be forcibly tasked with battling overwhelming odds for basic survival and reclaim Earth colonization.

Natural threats to life on Earth are far less than the nuclear missile weapons currently existent that CAN wipe out humankind--along with virtually ALL other plant and animal life on our planet........except maybe for the cockroaches.

It should be doomed.

Yes unless you are one of the elite that can afford a bunker so deep and well maintained that you can stay underground for 2 years.

We'll see.

By all means, yes. A large enough explosion would ignite the planets atmosphere and kill almost all life above water.

However even if a mega asteroid hit us, its highly unlikely one so big would be unnoticed. We'd see it months of years in advance and would probably both prepare to alter its course and evacuate people of necessity underground or into space.

Of we are talking an object the size of say a small planet of small landmass like hawaii, we would likley see it in advance and evacuate people off world to the moon or a station, having years to prepare.

Very slim chance one sneaks past and kills us all. More likley we notice and save some of our species either underground or in space or just alter its course

yes

Of course. That happened to the dinosaurs. It could happen to us. Chances are in won't happen for a very long time. By then, we might be able to deflect the meteor or move to another planet.

It's possible. But humanity is spread so far over the Earth that some would probably survive.

Yes, I went extinct 1,000,000 years ago