Billions of years from now,
the Sun will become a red giant.
And then, it will slowly die.
That’s right.
It’s the end of the Solar System,
and this is your survival guide.
For around 4.5 billion years,
our Sun has been the bright center
of our Solar System.
It's fueled by the nuclear fusion in its core.
And it burns through 661 million
tons of hydrogen every second.
During its stellar lifespan,
the Sun has burned through about half of its fuel source.
That means our Sun has another five billion years left in it.
As the Sun uses up its hydrogen through nuclear fusion,
it becomes more saturated with helium.
And that makes it spit out even more energy.
Every billion years that it burns hydrogen,
our Sun gets about 10% brighter.
Eventually, all that energy
will push out the Sun’s outer layers
and our star will swell in size.
Then, we'll have a red giant at the center of our Solar System.
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These next few decades could look bright for us.
But beyond that, well, things get tricky.
Let’s fast-forward to around 1.5 billion years from now.
Sorry to say but things
won't be looking too good for life on Earth.
The Sun's increased brightness
will set off intense global warming.
Our planet will become so hot
that our oceans would start to boil.
The increasing heat and radiation of our Sun
will shift the habitable zone of our Solar System.
And now, the area where liquid water could exist
will move out toward Mars.
Yeah, Mars will now become habitable.
And it could be humanity’s first destination for settlement.
But to create a breathable atmosphere,
we’d still have to terraform the red planet.
At this point,
Mars could remain habitable for as long as five billion years.
That’ll give us plenty of time to make our next move.
But in about 7.5 billion years,
our Solar System will have a giant problem.
A red giant problem, of course.
Our star will run out of its hydrogen fuel
and start burning helium instead.
The Sun will expand, completely vaporizing Mercury.
The atmosphere of Venus will burn up.
Eventually, the expanding Sun will swallow Venus whole.
And our Earth?
Well, it will get reduced to a dense, hot iron core.
Our new home on Mars won't be habitable anymore either.
Humanity’s best hope
would be to hop over to Europa,
Jupiter's fourth-largest moon.
Its thick layer of ice will melt from the Sun's increased heat.
Europa could become a wonderful water world.
Jupiter's moon could be our home for a few hundred million years.
That's when the Sun will reach its maximum size as a red giant.
It will shine about 3,000 times brighter than it does today,
and its surface could extend well beyond Earth’s orbit.
Eight billion years from now,
the Sun could make life intolerable as far as Pluto.
Our best hope at that point
would be to find a home on a distant dwarf planet
in the Kuiper Belt.
The temperatures there
could be similar to what we were used to on Earth.
Life on Earth would be a thing of the very,
very distant past for this generation of humans.
Two billion years after that,
our Sun’s fuel reserves will completely dry up.
The Sun will become unstable and will start to pulse.
This will cause it to shrug off its outermost layers.
The Sun will change from a red giant to a white dwarf.
This means it will shrink
until it becomes the size of Earth today.
It will blast off massive amounts of X-ray radiation,
but less heat.
So the habitable zone will dramatically shift once again.
It could go from the Kuiper Belt
to about where Mercury used to be.
For human civilization to continue,
we'd have to move onto another star's habitable exoplanet.
Our white dwarf star would radiate for quadrillions of years,
so moving back to its new habitable zone
wouldn't be a good idea.
When our former Sun used up the last of its energy,
it will no longer be able to shine or radiate heat.
But it will still have mass and gravitational pull.
It may become a black dwarf.
Scientists have yet to find any such stars
as they would have to be much older
than our 14 billion-year-old Universe.
Alright, so you've made it
to the end of the Solar System.
I'm sure it wasn't easy to say goodbye to the Sun.
But hey,
at least it’s not exploding tomorrow.
That’s a story
for another WHAT IF.