but I love your hair.

Oh, thank you.

You're welcome.

Did people tell you that they love your hair.

Yes.

It's a really good hairdo.

Now this is your first time on TV.

Do you feel-- like it?

How's it feel?

He feels really nice.

[LAUGHTER]

All right.

I think that was an answer.

All right, you're incredibly smart.

And what is your favorite thing to learn about right now?

My favorite thing to learn about now is astronomy.

Astronomy?

Because space never ever ends!

How is that possible?

Because it just is!

It just is!

It just goes on forever and ever.

I don't even understand it myself.

Yeah, me neither.

Yeah.

So you like all kinds of science.

Do you like biology?

Yes I love biology.

But a much smaller amount.

A smaller amount than astronomy.

Yes.

So I like to go outside and collect leaves and go

back inside and identify them.

Oh you do?

That's a really clever thing.

Because all the leaves and all the trees are different, right?

Yes.

Yes.

OK.

And you like chemistry?

Yes.

Yes.

What is your favorite element?

My favorite element is xenon because it starts with an X

like my name, Xander.

Yes.

Well I can see why you'd like that.

And what kind of element is that?

It's a noble gas.

A noble gas?

Are there other kinds of gases that are not noble?

There are other type of gases, but not called gases.

I see.

OK.

You know, I don't know that means.

[LAUGHTER]

OK.

I'M--

It means one of the--

I'm in over my head already.

Why would I do a follow up question?

OK.

I'm going to quiz you, OK?

How many moons does Mercury have?

None, because it's too close to the sun.

The sun would just suck it up.

Oh.

With a gravitational force.

Yes.

How many galaxies can you name?

Well I can name lots.

But really, realize there is about 120 billion.

There's 120 billion galaxies?

Isn't that incredible?

Yes.

[INAUDIBLE] the Milky Way is my favorite because it has only

one place on it that has life--

Earth.

[LAUGHTER]

Yeah.

The one that we live on.

Yeah, the one we live on.

Yes, I know that one.

And also it has the oldest star known.

What is that?

It's called Methuselah star.

Oh.

[LAUGHTER]

This is what I'm like at parties.

And then I just, I gotta get a drink.

I'll be right back.

How many moons does Jupiter have?

Jupiter has 79 moons.

Here are a few of their names.

So there is Ganymede, Callisto, Io, Europa, Amalthea, Himalia,

Thebe.

And there is Lysithea, Themisto, [INAUDIBLE] Iocaste, Kalyke,

Megaclite, and some others.

Like Aoede.

Gesundheit.

[LAUGHTER]

How old are you?

Five?

Yes.

OK.

What's the lifecycle of a star?

OK.

The life cycle of a star is first a gas cloud.

Then the star is rotating.

Then the core gets hot.

Then it turns into a protostar.

A protostar doesn't have much size or mass

to create nuclear fusion.

So then a yellow dwarf.

[LAUGHTER]

A yellow dwarf does have the enough mass

to create nuclear fusion.

Then a subgiant.

A subgiant is a mixture between a yellow dwarf and a red giant.

A red giant is the next age.

And then it turns into a red giant.

A red giant-- so if you place a red giant in our solar system

[INAUDIBLE] our sun.

Well, our sun will--

in like a billion years or so, our sun

will suck up all the planets to Mars.

All the inner planets.

We might have to live on Jupiter.

[LAUGHTER]

And also a red giant is very, very big.

And it would probably suck up some of the asteroids, too.

It would suck up probably a thousand asteroids

from the asteroid belt.

Hello?

tWitch, you got to hear this.

Start over.

Yep.

[LAUGHTER] So good.

OK, I'm listening.

Go ahead.

So, first there's a gas cloud.

Then it starts to rotate.

[LAUGHTER]

Then the cloud gets hot.

[APPLAUSE] Right.

Then it turns into a protostar.

Right.

A protostar doesn't have enough mass or even size

to create nuclear fusion.

Right.

Then a yellow dwarf.

A yellow dwarf--

Right.

Well, a yellow dwarf does have--

Much mass, right.

--to create nuclear fusion.

Then it turns into a sub-giant.

Uh-huh.

A sub-giant is like a mixture between a red giant

and a yellow dwarf.

Right.

So then--

Xander, hold on.

Hold on one second.

Can I speak to Ellen real quick?

Hold on.

tWitch, I'm going to call you back.

OK.

Thank you.

Here's what I-- here's what I want to do.

Because it sounds like they live a long time, right?

There's a long lifespan.

And we don't even have time for all that,

or else, because, you know, the news is coming up.

[LAUGHTER]

So what I want to do is I want to-- do you know

how you can have your own star?

Like I can put your name on a star

and you have your own star?

Do you know?

Yeah.

So I'm going to do that.

You're going to have your own star.

Let me show you what it is.

This is yours.

OK.

And so, when people talk to you, you can say,

I have my own star.

Yes!

You can find out where it is and tell us about it next time

you come back.

And you're going to want to see it,

so we got you some equipment, so you can look the stars.

I love it!

I'm so glad you love it.

And we what we got you over here!

[CHEERING]

I love it!

What is it?

[CHEERING]

What is it?

Isn't that great?

Yeah.

You have all this.

And you can sleep outside and watch things--

and if that's OK with your parents.

All right?

We love having you here.

You come back and see us anytime you want, OK, Xander?

You're fantastic.

We'll be right back.