Top 10 Biggest Meteor Strikes In History
Our beloved blue planet gets pelted with debris from space all the
time but, since most of it burns up or break apart in the atmosphere,
it’s usually not a problem. Even when one
does make it to the ground, they are rarely much larger than a small rock, minimizing the damage they’re capable of inflicting.
Then, of course, there is that once-in-an-eon occasion where
something very very large makes it through intact, and this can really
do some damage. Fortunately, such hits are extremely rare, but they are
worth noting, if only to serve as reminders of the power of the stars to
undo the normal routine here on Earth, with little more than a few
minutes’ warning. So where — and when — did these
monsters hit? Let’s take a look at the geological records, and see.
10. Barringer Crater, Arizona, USA
Already the home of the Grand Canyon, around 50,000 years ago Arizona decided to add yet
another tourist attraction,
when a 160-foot diameter meteorite landed in the northern desert,
leaving an impact crater nearly a mile wide and 600 feet deep.
Scientists believe the meteorite that caused the crater was traveling at
over 28,000 miles per hour when it struck, causing an explosion about
150 times more powerful than the
Hiroshima
atomic bomb. Some scientists initially rejected the idea that the
crater was caused by a meteor when no meteorite was found, but the
modern consensus is that the rock melted in the explosion, spreading a
mist of molten nickel and iron across the surrounding landscape.
Though at a mile across, the crater is not all that large, the lack
of erosion makes it an especially impressive site. In fact, it’s one of
the few meteor craters that actually looks like what it is, making it a
first-class tourist attraction — precisely as the Universe intended.
9. Lake Bosumtwi Crater, Ghana
When one stumbles upon a natural lake that is almost perfectly round, that’s a little suspicious. Such is the case with
Lake Bosumtwi, a five-mile diameter body of water that lies some twenty miles southeast of Kumasi,
Ghana.
This was created when a 500-foot diameter meteorite hit the region some
1.3 million years ago. Efforts to study the crater closer have been
complicated by the fact that the lake is difficult to get to, because of
the thick rainforest that surrounds it, and the fact that the local
Ashanti people consider it to be sacred (they consider it forbidden to
touch the water with iron or use metal boats, making drilling for nickel
on the bottom problematic.) Still, it remains one of the best-preserved
craters on the planet today, and an example of the destructive power of
megarocks from the stars.
8. Mistastin Lake, Labrador, Canada
At a “mere” 38 million years old, the
Mistastin crater from Labrador,
Canada,
is an impressive eleven-by-seven mile hole in the ground which, due to
erosion from the many glaciers that has scoured that part of Canada over
millions of years, was likely originally far larger than it is today.
What’s unique about this crater is that, unlike most meteor impacts,
this one is elliptical in nature rather than circular, suggesting that
the rock hit at a shallow angle, rather than straight on like most big
impacts. Even more unusual is that there is a small island in the middle
of the lake which could be the central uplift of a complex crater
structure, making it even cooler.
7. Gosses Bluff, Northern Territory, Australia
Equally impressive from both the ground and the air,
this 142-million-year old, 15-mile diameter crater, near the center of
Australia,
was created when an asteroid, estimated to have been a good 15 miles in
diameter, hit the surface at an impressive 40,000 MPH, gouging out a
hole some 16,000 feet deep. That’s the energy equivalent to 22,000
megatons of TNT, suggesting that life on the continent likely had a
difficult time in the immediate aftermath of this little incident. Now
one of the most significant impact structures in the world, the highly
eroded crater stands as a stark reminder of the power one big rock can
have.
6. Clearwater Lakes, Quebec, Canada
It’s cool enough to find one meteor crater, but to find
two of them
side-by-side is twice as cool. This is exactly what happened when an
asteroid split in two upon entering the Earth’s atmosphere some 290
million years ago, creating two monster impact craters on the eastern
shore of
Hudson
Bay. Since then, erosion and glaciers have eroded much of the original
craters away, but what remains is still impressive. One lake is some
twenty miles in diameter and the other just under fourteen. Given the
amount of erosion that has occurred over the last 290 million years, one
can only speculate how much larger they must’ve been when first
created.
5. The Tunguska Explosion, Siberia, Russia
This one is a little controversial, as it didn’t leave any pieces of itself, making it a source of debate as to
what exactly it was
that hit this little corner of Siberia a mere 105 years ago. The only
thing that’s known for certain is that something pretty big, and moving
very fast, exploded near Russia’s Tunguska River in June of 1908,
leaving over 800 square miles of forest flatter than a squirrel on the
freeway at rush hour. So large was the explosion in fact, that it was
detected on instruments as far away as Great Britain!
Since no bits of meteorite have ever been found, some believe the
object may not have been a meteor at all, but a small chunk off a comet
(which, if true, would account for the lack of meteoric material.) To
further muddy the waters, there are also those who contend that what
actually exploded was an
alien spaceship. While completely unsubstantiated and totally speculative, we gotta admit it’s a pretty fun theory.
4. Manicouagan Crater, Canada
Manicouagan Reservoir,
also known as the “eye of Quebec,” was created some 212 million years
ago, when a 3-mile wide asteroid hit the Earth. The 62-mile-wide hole
that it left has been worn away by the passing of
glaciers
and other erosive processes, but it remains impressive nonetheless.
What’s especially unique about this particular crater is that, instead
of just filling with water to become a near-perfect circular lake, this
one is mostly dry land, ringed by a natural mote. That would make it a
great place to build a castle, one might imagine.
3. Sudbury Basin, Ontario, Canada
What’s with Canada and impact craters? It appears that
Alanis Morrisette’s beloved homeland has an inordinate number of meteor craters, with the one near
Sudbury,
Ontario being the largest of the bunch. 40 miles long, 16 miles wide,
and 9 miles deep, this 1.85 billion year old crater is actually home to
some 162,000 people and a number of mining companies, who discovered
over a century ago that the bottom of the basin is super rich in nickel
because of the asteroid. Rich enough, in fact, to provide about 10% of
the world’s nickel supply!
2. Chicxulub Crater, Mexico
This is
the one
that may have done in the dinosaurs, and is one of the largest meteor
strikes in Earth’s history. The impact happened roughly 65 million years
ago, when an asteroid the size of a small city crashed onto Earth with
the destructive power of 100 teratons of TNT. That’s one
billion
kilotons for those of you keeping score. Compare that to the Hiroshima
bomb, which released the equivalent of just 20 kilotons of TNT and you
get the idea.
Not only did it leave a 105-mile diameter hole in the ground, but it created mega-tsunamis,
earthquakes,
and volcanic eruptions around the globe, that dramatically altered the
environment and doomed our reptilian friends (along with a lot of other
critters, it appears.) Buried beneath the Yucatán Peninsula in Mexico
near the village of Chicxulub (after which it is named,) this vast
crater can only be discerned from space, which is why it took so long
for scientists to find it.
1. Vredefort Dome, South Africa
While the Chicxulub Crater is better known, it’s a mere pothole compared to the 186-mile-wide
Vredefort Dome
in South Africa, which currently holds the record for being the largest
impact crater on Earth. Fortunately, in hitting over two billion years
ago, the meteor/asteroid (estimated to be about six miles in diameter)
didn’t do a lot of damage to life on Earth, as there were no
multi-cellular
organisms
around at the time, or things could have gotten dicey. No doubt it
adversely affected Earth’s climate at the time — not that anyone
noticed, of course.
Today, the original crater is mostly eroded away, but what remains is
still impressive when seen from space, and serves as a graphic reminder
of just how scary our little corner of the Universe can be.