Out there, we find the most extreme objects in the universe.

In this case, a black hole.

An object so massive that even light cannot escape.

Grandpa, what are black holes?

Black holes.

Something that is super heavy and that's why you can't see it.

I don't know.

You should ask your father when he comes back.

Okay.

Grandma, what is a blazer?

It's a piece of clothing, honey.

No, Grandma.

I meant like that on the TV.

Ah, that one?

I have no idea.

Something in space, I assume?

You should really ask your father when he's back.

But when will he be back?

For Christmas?

No, sadly I don't think so.

They'll probably keep him at the telescope until New Year.

I really wish he would be back here for Christmas.

I know Noel.

I know.

Dear Santa, I hope this letter finds you well.

This is the first time I've written you a letter.

But I don't know what else to do.

I am really sad.

Because my father won't be here for Christmas.

See, he's an astrophysicist.

Which means he has to stay at his telescope over Christmas and not here with us.

I just want to see him on Christmas.

Please, Santa.

I love Grandpa and Grandma.

But they can never answer my questions as good as Dad can.

Please bring him back to me on Christmas.

Noel.

Once upon a time, in a candy cane office in the middle of the North Pole

at the research center, Santa Claus was about to make one of the most significant discoveries

in the history of Christmas.

Maybe it is not known to everyone that there was a time when Santa used to deliver presents only on Earth.

But thanks to this incredible discovery, things were about to change.

Think about all those kids spread in the whole universe that were ignored by Santa up to that point.

Imagine how sad they could have been without Christmas presents.

Anyway, Santa had been racking his brains all day about the laws of physics

and how he always seemed to sort of bend them on Christmas.

In the evening hours of that fateful day, a bold idea formed in his mind that would change the future forever.

An idea that was like a virus.

Resilient, highly contagious.

You know, the smallest seed of an idea can grow.