The strongest magnet in the universe
has been discovered.
It's an exotic, ultra-rare neutron star.
It's called GRO J1008-57
and it's got a magnetic field over a
trillion times stronger than the Earth's.
Stars like this are so strong that they have
the power to do ridiculous things to anything
that comes even remotely close.
If you got within 1000 kilometres of it,
you'd simply dissolve.
Your atoms would be super stretched.
Their shape would warp into
something completely unrecognisable.
The molecular structure that makes you up?
Forget about it.
It's gone.
You'd just disappear.
So nothing good can come from messing
with a star like this.
But how magnetic is it?
Well its field is calculated to be
1 billion tesla.
Tesla is the unit we use to measure how
magnetic something is.
Just to put this into context,
the Earth's magnetic field is
a millionth of a tesla.
But we've cooked up
something far stronger in the lab.
This is what twelve hundred Tesla did.
Despite its supercharged magnetic strength,
the star is actually incredibly small.
It has a diameter of 20 kilometres.
You might be wondering just what makes a star
like this so magnetic?
First, we need to find out more about how
these neutron stars and their rarer subtypes
come about.
Neutron stars are created by the
death of massive stars.
Having run out of fuel,
their upper layers are obliterated
and the core collapses.
We witness an extreme explosion, a supernova.
Leftover electrons and protons come together
to form neutrons, and with the right solar
mass, we end up with a neutron star.
A severely squashed down version of what was
there before.
Astronomically speaking,
they're the densest thing out there.
If you dropped a marshmallow onto
a neutron star, it would have the energy
of an atomic bomb
because the gravity is so powerful.
So they're cosmically very small
but unbelievably dense.
Let's put it another way.
If I had a matchbox full of neutron star
material, it would weigh
approximately three billion tonnes.
Or let's go another way.
Maybe something smaller, like a sugar cube.
A sugar cube of neutron star stuff would weigh
as much as a mountain.
And I'd be very strong.
But what stuff makes up neutron stars?
Why are they so dense?
Well their insides are a bit of a mystery.
We know that they have atmospheres
made up of hydrogen and helium
and an outer and inner core made from
neutrons, electrons and atomic nuclei.
But we still don't know what hyper-dense matter
lies at their centre.
So does this density cause a
star's mega-magnetism?
Actually, we don't know.
This takes us literally to the edge of
scientific thinking.
Scientists believe that
as a neutron star is born,
the magnetic field of the previous star
shrinks.
Combine this with this unusual, highly-dense
matter, and this could cause the phenomenal
magnetism it wields.
So we don't really know why a neutron
star is so magnetic.
It's a total mystery.
But the neutron star's density is just
the tip of the iceberg.
They are capable of far stranger things.
We observe binary systems of two neutron
stars that are in orbit around each other.
And when we observe these systems,
we see them getting closer and closer together
all the time.
So what will happen eventually is that
they're going to collide.
And when they merge,
the neutron stars will be completely destroyed
and form a black hole.
So when two neutron stars fuse together,
colliding violently,
this can create black holes.
But this can also give birth to things
called magnetars.
And that's what is believed to have happened
with our strongest magnet.
However, there's another reason it's one of the
rarest stars in existence.
Not only was it once a magnetar,
it's now what's known as an x-ray pulsar.
This pulsar is truly incredible.
It exists in a binary system with another
star orbiting each other.
But it's not an equal relationship.
The highly magnetic pulsar feeds off its
lower density companion,
with energy accumulating at its
magnetic poles,
it gives off bursts of x-ray pulses,
like a lighthouse in the deep, dark corner of
the universe.
Dame Jocelyn Bell Burnell
discovered them in 1967 and wrote the rulebook
for how we monitor these phenomena.
The pulses are short and quite steep,
so these things have to be small.
The other thing that we very quickly
established was that the post period was
very, very constant.
It wasn't getting tired, which means it's got
large reserves of energy,
which means it's big.
So it's small, but it's big.
So you have to be more precise in what you're
saying.
It's small in width, it's big in mass,
so high density.
That's the first Pulsar. CP 1919,
So that's what it sounds like
if you listen to the radio signal.
So that's the whole star
spinning at that rate.
And there are some that are even faster.
You listen to the fastest one,
it would sound like your kitchen blender
it's going at 700 revs per second.
But we still don't know so many things about
stars like the strongest magnet in the
universe.
Crucial elements of the mystery
remain unsolved.
Why are these stars so magnetic?
And what is hidden deep in their core?
Maybe one day
the star's secrets will be revealed.