Name: 如果地球有一個大橢圓軌道呢？ (What If Earth Had a Large Elliptical Orbit?)
Uploaded: 2021-01-14T10:39:56.000Z
Duration: 3 min 47 s
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What if Earth's orbit ventured as far from the Sun as Pluto,

if the Earth had a large, elliptical orbit.

The Sun has a stronger gravitational pull on us

But other planets are slightly pulling us toward themselves, too.

That, together with the Earth's velocity,

and the closest point to the Sun in our orbit

is less than 5 million km (3 million miles).

That's nothing compared to the overall distance of

150 million km (93 million miles) from us to the Sun.

But what if that difference was much, much greater?

The Earth orbits the Sun at just the right distance -

not so far away that we turn into an icy rock,

and not so close that we burn to a crisp.

Even the slightest shift in the Earth's orbit would change that.

The closer we got to the Sun, the more heat would hit the planet.

Think it would be nice to have summer all year long; everywhere on Earth?

I bet you'd change your mind pretty fast.

all the ice on the planet would start to melt.

Global sea levels would rise 70 meters (230 feet):

enough to cover London's Tower Bridge and flood most of the planet.

With little land left to absorb the scorching heat from the Sun,

All this would leave us with a tremendous amount of carbon dioxide in the air,

the surface temperature of the Earth would go up to 460°C (860°F).

Being outside would give you severe burns,

no matter how much sunscreen you put on your skin.

After getting an incredible suntan on our vacation near Venus,

we'd head back across the Solar System all the way to Pluto.

But it wouldn't matter for most life forms on the planet.

They wouldn't have survived the extreme heat.

some new life form would evolve on the Earth

while it's traveling to the habitable zone again.

But that life wouldn't last too long, either.

The upcoming winter would be long, and very cold.

it would freeze as we reached the -220 °C (-360 °F) temperature of Pluto's orbit.

If the Earth kept moving at the same speed it does today,

it would take it about 20 years to make a full orbit -

That's if we didn't collide with any other planet on the way,

But it is likely that we'll be making this trip solo.

The Moon might not be able to handle the pressure

the Earth would at least get to enjoy some spectacular views.

Who knows? Maybe we'd sail too close to Jupiter

and become one of the moons of the gas giant.

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如果地球有一個大橢圓軌道呢？ (What If Earth Had a Large Elliptical Orbit?)

approach

incredible

slightly

tremendous