Practice English Speaking&Listening with: Ancient Aliens: The Origin of the Moon (Season 11) | History

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NARRATOR: Humans have been mesmerized by the moon

since the dawn of man.

And although many theories have been proposed,

scientists cannot say with absolute

certainty how this celestial object came into being.

When I was a student, nobody really

knew where the moon came from.

But because it's so relatively big, this was a real problem.

And I think that there is a tendency

to think that moons get somehow captured by the parent planets.

If you've got one body here and another body coming along,

it can't just get trapped into orbit like that.

The difficulty there is just basic physics.

So this remained a puzzle until about 20 years ago,

when another theory came along.

And that is that proto-Earth was, very early

on in the history of the solar system,

hit by a Mars-sized body, hit obliquely

that this Mars-sized body plowed into the center of the Earth

and became the Earth's core, and a lot of the outer material

got stripped off by this gargantuan collision

and coalesced to form the moon.

Now, they had to come up with a very bizarre theory for how

the moon came into being because all the conventional theories

don't make any sense.

The best theory of the moon's formation

is phantasmagorically catastrophic collision

of two things, you know, at just the right angle

to form this belt of debris that then formed the moon.

But the moon, its exact size is such that it

gives us total eclipses.

Its disk exactly covers the sun.

And the chances of that occurring

are so literally astronomically small, it's very disturbing.

NARRATOR: The sun's diameter is 400

times greater than the moon.

And coincidentally, the sun also happens to be nearly precisely

400 times further away.

This is the reason that the sun and the moon

appear the same size in the Earth's sky,

and why we on Earth can experience eclipses of the sun.

DAVID CHILDRESS: It's just perfectly in that orbit

to eclipse our sun.

The odds of the moon being in that orbit

accidentally are a zillion to one.

So that right there is evidence that our moon

is in a perfect orbit around our planet that's not accidental.

MIKE BARA: In order to have a solar eclipse,

the moon has to be exactly the size that it is,

which is 2,160 miles.

Not 2,161, not 2,159, but 2,160 miles at its equator.

And there are people out there that actually

think that's a coincidence.

The fact is is that that is by design.

NARRATOR: Throughout our observable galaxy,

this relationship and others have not been duplicated.

Other moons are sizeably smaller by comparison

to their mother planet.

Earth's satellite not only orbits closer than it should

for its size, it is also the only moon

in the solar system that has a near perfect circular orbit.

And no other lunar bodies are known

to have such a stabilizing role as the moon has with the Earth.

WILLIAM HENRY: Recent computer simulations

have shown that, without the moon's presence,

the Earth's axis tilt would be completely

different than it is today.

We might not even have seasons as we know them presently.

Without the seasons, it could be very difficult for life

on Earth.

So the moon is actually performing

an incredible function.

It's life-sustaining.

Without it, we might not be here.

ALAN BUTLER: There are so many peculiarities about the way

the moon has affected the Earth that one might be forgiven

for believing that there is intelligence behind it,

that something made it that way.

The moon is so strange, so odd in terms

of what we find elsewhere in the solar system,

and particularly in terms of what it does for the Earth,

having made the Earth into a haven for life,

that one feels obliged to ask the question,

could such things have come about by chance?

Was it placed there deliberately?

Was it engineered, maybe by aliens?

And therefore, is our whole existence a planned event?

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The Description of Ancient Aliens: The Origin of the Moon (Season 11) | History