Name: 巨大的死亡之星威脅地球（第六季）------------------------------歷史 (GIANT DEATH STAR THREATENS EARTH | The Universe (Season 6) | History)
Uploaded: 2021-01-14T09:42:04.000Z
Duration: 5 min 16 s
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that Earth has been the victim of a series

of impacts caused by an orbiting Death Star seems unlikely.

After all, when we look at the sky, we only see one sun.

But in fact, the majority of stars come in pairs.

And so close encounters with nearby stars,

nearby rogue planets, even, were much more

common during the very earliest days of the solar system's

NARRATOR: Most of these solar brothers and sisters

But according to the Nemesis hypothesis, one of them

is still out there, still circling the sun,

still causing periodic chaos amongst the comets,

and still waiting to rain death on the Earth once more.

will be faced with a monumental threat when Nemesis

almost in exactly the same places that they are now.

NARRATOR: But according to the Nemesis hypothesis,

a major change is underway one light year from the sun.

A dark reddish star has entered the Oort cloud.

If humans still exist on Earth, they'll face a slow building

ALEX FILIPPENKO: The Oort cloud contains perhaps 10 trillion

it's not like you would be pelted by comets all the time.

The spaces between them would be pretty big.

NARRATOR: Like a bowling ball in a juggler's hands,

Nemesis simply shuffles some comets out of its way.

The Oort cloud has an empty region in the middle.

It's been cleaned out by Jupiter and by the sun.

the inner solar system becomes a shooting gallery.

And so there start to be a few more comets than usual.

And at the peak, there might be 1,000 to 10,000

Earth would be in the crosshairs of this comet storm

RICHARD MULLER: Over a period of a million years,

there would be visits by about a billion comets.

it turns out one of them will hit the Earth, one or two.

GREG LAUGHLIN: It would be difficult to predict exactly

But there would be this phase, this sort of danger zone,

in which the chances for a catastrophic impact,

something of a comet size, would be much, much higher

NARRATOR: Will the impact spark another catastrophic extinction

RICHARD MULLER: I like to joke that Nemesis

In between the last extinction and the next one,

there's plenty of time for intelligent life

to get its act together to make sure that next time

Nemesis comes back and the sky is filled with comets,

Until scientists either discover Nemesis or definitively rule it

CLIFFORD JOHNSON: It's important to realize this is not

Clearly, these objects colliding with Earth happen very rarely.

But on the other hand, when they do collide,

get better understanding of our solar system

Because it may be crucial for our survival.

NARRATOR: If the future sky one day does fill with comets,

to save itself, rather than end up one more

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巨大的死亡之星威脅地球（第六季）------------------------------歷史 (GIANT DEATH STAR THREATENS EARTH | The Universe (Season 6) | History)

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