ฝึกพูดภาษาอังกฤษด้วยเทคนิค Shadowing จากวิดีโอ: Ancient Life as Old as the Universe

Life has existed on one planet for about 4 billion years,

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Life has existed on one planet for about 4 billion years,

as far as we know.

But it might have started right after the Big Bang,

when the universe was much stranger and more fantastic than today.

A universe that might have allowed life to develop absolutely anywhere.

The cosmos might be full of the seeds of life,

sleeping in a dead desert,

waiting for a few drops of rain to explosively bloom and grow.

Tiny and not-so-tiny aliens might be everywhere.

In this video, we're going to put together two highly speculative yet scientifically grounded possibilities.

Check out the scientific papers in our sources.

To properly explain it, let's first look at the paradox of life on Earth.

The Life Paradox For its first few hundred million years,

Earth was a magma hell, constantly bombarded by asteroids.

But basically the second things calmed down and the first oceans formed,

life just appeared and zillions of microbes settled every nook and cranny they found.

This is kind of strange.

Life on Earth seems to be almost as old as the planet itself,

as if it was waiting around for an opportunity.

But life didn't only appear extremely quickly.

In that tiny time window,

it also crossed a huge gap.

qualify as living things, even microbes need to eat, poop, grow and multiply.

To do that, they need a genome,

the biological instruction manual that sets the inner workings of an organism.

How dead things with no genome become living things with genomes is one of the biggest riddles of science.

Simplifying a lot, the problem is that to have a functioning genome,

you need proteins, and to make those proteins,

you need a functioning genome.

Both proteins and genomes are super long molecules made of pretty complex blocks that are extremely difficult to assemble by chance.

It's a chicken-egg paradox with several chickens and eggs.

Once you have a finished cell,

the whole system works efficiently.

But starting from simple dead stuff and reaching

that level of sophistication by pure chance should require an amazing amount of time for trial and error.

So how did the first living things manage to cross that gap in just a few hundred million years?

Most theories about the origin of life try to explain

that gap by theorizing how some primitive superprebiotic molecules could have efficiently produced the first self-replicating entities.

But we still don't know how exactly this would have worked.

Maybe we need to think backwards.

The Clock of Evolution Think of genomes as a book telling the history of life.

As time passed and life evolved, more characters were introduced.

Amoeba, fish, amphibians, dinosaurs, and mammals.

Over billions of years, the story of life got more and more complex.

A genome can be viewed as a long string of letters with biological instructions.

And from microbes to us today,

functional genomes seem to have been increasing in size at a fairly constant rate.

The functional genome of fish is more than twice that of worms.

Our functional genome is about twice bigger than that of fish and so on.

It is a bit more complicated,

but for now, let's run with this.

When we put all these clues together,

it seems that genomes have been doubling in size on average every 350 million years or so.

As if evolution had been following an exponential inner clock.

But it gets even stranger.

The very first microbes that emerged on Earth,

even if they look simple,

already seem to have had pretty long and complex genomes.

But how could life have achieved that level of complexity in such a short time?

There may be an interesting way to solve this riddle.

We just take our exponential clock and extrapolate it back in time to the simplest conceivable life form.

Something equivalent to a being with a genome containing just a few letters.

But if we do that,

we end up 10 billion years in the past,

more than twice the age of Earth,

which means if life actually evolved like this,

it didn't start here, but somewhere out there in space.

This would explain why life started to thrive so quickly on our young planet.

If it was already present in space like a seed,

It just needed water and warm temperatures to wake up and go on evolving.

And it would also explain the high degree of sophistication of the first life forms on Earth.

They could have been complex already,

because they might have been evolving for billions of years somewhere else in the universe.

But could life really be that old?

Maybe, yes.

Actually, life could have started shortly after the universe itself was born.

A Goldilocks baby universe At its most basic level, life needs two things.

the right chemical elements to form complex molecules,

and a liquid medium, like water,

in which those molecules can move and interact.

The liquid medium needs to stay warm enough to remain, well, liquid.

So when we search for life in space,

we focus on Earth-like planets at just the right distance from their star,

warm enough to sustain liquid water.

But there was actually a time when almost all of the universe might have been habitable.

Right after the Big Bang,

The universe was extremely hot,

but as the cosmos expanded it cooled and Between about 10

and 17 million years after the Big Bang

when the universe was a thousand times younger than today It was between 100 degrees Celsius

and 0 degrees Celsius the temperature at which water is liquid

So for this window of time more than 13.7 billion years ago the whole universe

absolutely every inch of it had the right temperature to support life.

Of course, the right temperature alone is not enough for life.

We also need chemical elements like carbon and oxygen,

which are forged in the cores of stars.

But were there stars in super early cosmic times?

Maybe, yes, in regions of the universe where matter was especially dense.

Such stars would have been very massive and gone supernova in just 3 million years,

100

years, seeding the baby universe with the chemical elements needed to form dust,

101

asteroids, planets and the ingredients of life.

102

Maybe the first ancestors of life were more exotic and didn't even need water,

103

but thrived in substances like ammonia or ethane that can stay liquid at temperatures far below zero degrees Celsius.

104

They could have been sustained by the lingering warmth of the Big Bang for tens of millions of years longer,

105

well into a time when we know for sure there were stars and all the chemical elements.

106

The real magic of this idea is that while the universe today is extremely deadly and hostile,

107

back then the conditions for life might have been basically everywhere.

108

For a period that may have lasted several dozen million years,

109

primordial life might have been able to emerge on any rock,

110

even between the stars, sowing the universe with the seeds of what,

111

billions of years later, would become bacteria,

112

trilobites, dinosaurs, and finally us.

113

At some point, the universe cooled down below the right temperature for life to thrive,

114

but some of those ancestral life forms may have continued to exist in the internal warmth of the first planets,

115

frozen in asteroids or hibernating in cosmic dust,

116

tiny seeds roaming the cosmos waiting for new hospitable places to continue evolving.

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If they did, life now might be everywhere in the universe. Will we ever know?

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All this makes for a nice story.

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And while both the habitability of the baby universe and our exponential clock of life are reasonable ideas,

120

they're still speculative.

121

One more possibility among many others trying to explain our existence today.

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But if life came to Earth from outer space,

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then it should have seeded other places in the solar system too.

124

Maybe there are fossils in dry riverbeds on Mars.

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will soon find life in the warm underground oceans of Enceladus or Europa.

126

Titan has seas, rivers and lakes of ethane and methane as warm as the universe when it was 90 million years old.

127

So finding exotic life on Titan would support the idea that life could have originated in the weird baby universe.

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So far when we look out into the cosmos we don't see anyone like us.

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But maybe that's because life needed 10 billion years

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or more to reach the level of complexity that allows for a technological species.

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Maybe there are millions of worlds filled with microbes,

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oceans full of exotic fish,

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and continents of bizarre animals.

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And maybe even others like us that just recently gained consciousness and are beginning to look at the sky,

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wondering if they're alone.

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Life could be flourishing right now in uncountable forms and in all kinds of cosmic environments.

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And if many of us share a common cosmic origin,

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we would all be part of a great cosmic family.

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The answer may lie in our cosmic backyard.

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Let's go and find out.

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ฝึกพูดภาษาอังกฤษด้วยเทคนิค Shadowing จากวิดีโอ: Ancient Life as Old as the Universe

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