Name: 关于可能杀死恐龙的另一种理论（An Alternative Theory About What Could Have Killed The Dinosaurs）
Uploaded: 2021-04-17T06:34:43.000Z
Duration: 2 min 15 s
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關係子句

A group of scientists is saying that the asteroid impact that killed off the dinosaurs might've

changed the world far more than we realized!

Some 66 million years ago, a 10-kilometer-wide asteroid hit the Yucatan Peninsula and the

global effects killed more than three-quarters of all species, including dinosaurs and many

The immediate aftermath was earthquakes, tsunamis, and volcanic eruptions, as well as vaporized

rock launched high above the surface that heated as it fell back to Earth, sparking

And these fires are what changed the climate and decimated most living things!

According to this new model: Soot from the global wildfires was heated by the Sun and

There, it created an impenetrable barrier around the globe.

The planet is as dark as a moonlit night in the middle of the day, meaning little to no

Any plants not killed by wildfires are dead.

The the lynchpin of the ocean food chain -- phytoplankton -- is gone.

All the species that rely on these for food are dead.

The atmospheric soot causes global surface temperatures to drop by as much as 28 Celsius

But the soot in the atmosphere keeps absorbing sunlight, heating the stratosphere, sucking

up water vapour, and destroying the ozone.

Eventually the atmosphere is cleared of soot, but only after a year of darkness, and then

Amazingly, this model shows it doesn't take a lot of soot for this kind of global devastation

One simulation used just 5 billion tons of soot, about a third of what scientists think

But this simulation isn't exact to how the world was 66 million years ago.

While nuclear warfare or a smaller impact wouldn't have the same effects, either would

still put enough soot into the atmosphere to cool the surface and heat the upper atmosphere,

potentially changing the global climate enough to wipe out multiple species.

Speaking of wiping out species like dinosaurs, what colour were dinosaurs really?

We dug into it in this episode right here.

Let us know what other interesting science questions you'd like us to answer in the

comments, be sure to like this video, and subscribe for more Seeker.

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关于可能杀死恐龙的另一种理论（An Alternative Theory About What Could Have Killed The Dinosaurs）

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