to have miniature version of our Sun right here on Earth.

This is WHAT IF,

and here's what would happen

if we built a replica of the Sun on Earth.

The Sun is an enormous nuclear fusion generator.

Every second, it fuses 620 million tons of hydrogen

into 606 million tons of helium in its core,

releasing a vast amount of energy in the process.

To create a replica of the Sun on Earth,

we'd just need to squeeze atoms of hydrogen hard enough to make them fuse.

Shouldn't be too hard, right?

Well, this fusion is only possible at extreme temperatures.

Even the Sun's coldest part, its surface,

burns at an incredible 5,500 °C (9,900°F).

Not even a space suit can protect you from that kind of heat.

But we could engineer a high-temperature superconductor

to tame our scorching mini-sun.

What would it take to bring this brighter future into reality?

Having an artificial sun on our hands

would provide us with almost limitless amounts of energy.

Of course, it would be much smaller than the Sun.

Our replica could fit inside a machine the size of 60 football fields

and would have the weight of three Eiffel Towers.

To make it work, we'd need two specific hydrogen isotopes.

One of them, called deuterium, we'd extract from water.

The other one, tritium, we'd brew from lithium during the fusion reaction itself.

We'd give the mini-sun its own magnetic field

with the help of huge magnets, at least a thousand times more powerful

than those you put on your fridge.

This field would keep the artificial sun in place

while we're heating it up to 150 million °C (270 million °F).

Few materials could handle the scorching plasma of our sun.

We'd have to create a robust "blanket" for it,

one that wouldn't melt during this scorching fusion.

Once we had all the engineering issues figured out,

the artificial sun would completely change the way our energy system works.

It wouldn't emit any greenhouse gases.

And there would be no hazardous radioactive waste left

to decay slowly over a thousand years.

Unlike fossil fuels,

we'd never run out of hydrogen -

the most common element in the Universe.

With this clean and safe source of energy, we'd stop adding fuel to climate change.

And maybe give our planet a second chance.

Next, we'd build fusion engines for our spacecraft

and go on to explore space faster than we ever imagined.

With hot plasma fueling up our rockets,

it would take us just 30 days to get to Mars.

Huge progress compared to a nine-month trip with our current technology.

Sound like science fiction?

What if I told you physicists around the world

have been working on re-creating a miniature star for decades?

We already have reactors capable of producing sunlike fusion.

But so far, none of them have produced more energy

than they needed to consume to make this reaction happen in the first place.

Everything could change with a new class of high-temperature superconductors.

That would bring nuclear fusion from an expensive science experiment

to a viable source of energy, available to everyone.

By the time scientists figure it out,

we may have moved off Earth and onto the nearest planet.

But that's a story for another WHAT IF.