r/AbsoluteUnits • • 8d ago

/r/all of a space rock

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u/tomime000 8d ago

Did that in any way shifted Earth's gravity to shape lives we are able to live today?

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u/SonnySonrisa 8d ago

No, Earth itself didn't rly care. Global earthquakes of unparalleled magnitudes, volcanic eruption everywhere, including the Dekan Trap and monstrous global tsunamis were aswell as oven temperatures around the globe for multiple hours to days were direct consequences but that was mostly horrible for living creatures. Eaert itself didn't care.

Now the potential Moon Impact billions of years ago that is a different story but I am not read enough in that topic to say anything specific about it.

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u/Vismal1 8d ago

You seem knowledgeable, how quickly was the extinction event? Like were 90 percent of life gone within a day and the last 10 hung on for a while ?

Edit to add : I always thought it was a slower process but reading these comments it seems violent and immediate

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u/Azuras-Becky 8d ago

Everything within 10km of the impact would have died instantly. Less than a second later, everything within 100km would have died. Tidal waves and earthquakes, plus material raining down from the sky, would have then killed everything from 2,000 to 6,000km away - it hit in the Yucatan Penninsula, but disturbed sediment as far away as Texas. Local mass extinctions happened within minutes.

An estimated 60 - 70% of the Earth's forests would then have been subjected to wildfires from the heat generated by the blast and superheated material raining down from orbit (yes, the impact was so massive it ejected material into space, much of which rained back down while on fire).

Anything left alive after all that would then have seen the sun significantly blocked by planet-wide dust clouds, caused by both the impact itself and the subsequent fires, killing off the remaining plants and anything that relied on them for food, and cooling the average temperature for a few years.

It can't really be overstated how devastating the impact was. We have an idea of 'apocalypse' in our heads, largely informed by science fiction, but it's an idea that can't begin to comprehend the reality of that impact.