And this is a neutron star.

But don't let its size fool you.

Neutron stars are massive

gravitational monsters,

and orbiting one wouldn't end up well

for our planet.

But what if we took just a spoonful of it,

and transported it to Earth?

Such a tiny amount of a neutron star

couldn't possibly destroy us all...

When a star about four times the size of our Sun

explodes in a supernova,

it propels its outer layers into space,

leaving only a dense collapsing core behind -

a neutron star.

Neutron stars are very, very dense.

They could have the diameter of a small city,

but their mass would be

1.4 times the mass of our Sun.

Of course, no neutron star

will ever appear on our planet by itself.

First, you'll have to grab a spoonful of it

and bring it back to Earth.

You'll find the nearest neutron star,

nicknamed Calvera,

617 light-years away from Earth.

If you jumped in the fastest spaceship we've ever built,

it would still take you 11 million years

to travel to Calvera.

I'll have to fast forward here and meet you

in the neutron star's neighborhood.

You'd be trying to get your spacecraft

through a magnetic field that's

tens of millions of times stronger than Earth's.

Your ship's computers would be useless

if they had any ferromagnetic materials

like iron, nickel or cobalt in them.

You wouldn't want any of those materials

anywhere in your craft.

You'd have to dodge the electromagnetic radiation beams

shooting from the star faster than you can blink.

And then, when you finally managed

to get to the surface of Calvera,

you'd be immediately vaporized

due to the temperatures being around 1 million degrees.

Celsius, Fahrenheit -

at this point, would it even matter?

Any part of your craft that wasn't vaporized,

would be crushed by the star's intense gravity.

But let's not end your story right there.

Instead, let's equip you with a super suit

that could withstand the insanely hot temperatures

and extremely high pressure of a neutron star.

And here you have it -

a spoonful of Calvera loaded on your ship.

Now what?

If you tried to scoop the Sun with a teaspoon,

you'd only get about 2 kg (5 lbs) of it.

The same amount of a neutron star

would weigh anywhere from one billion

to six billion tonnes.

You wouldn't be able to lift that spoon in the first place.

And that's not even the worst part.

Because the gravity of a neutron star is so intense,

it fuses protons and electrons together.

Only neutrons are left in that stellar core.

When they aren't buried down inside a star,

neutrons don't last too long.

After ten minutes, the scoop of a neutron star

would break down into protons and neutrons,

and release as much energy as the Sun produces

in two or three seconds.

Good thing you didn't have enough time

to bring that stuff back to Earth.

Leave neutron stars where they belong -

far, far away from us.

And if one ever comes a little too close to Earth,

jump on a spaceship

and escape to another planet outside the Solar System.

But that would be a story for another WHAT IF.