06/03/2017 Newsround

Good morning, guys!

Jenny here with your first Newsround this Monday.

First, to the experiment with two twin brothers that's

completely out of this world.

Watch this.

This is Scott Kelly.

He's a NASA astronaut and this is his identical twin brother,

Mark, who also used to be a NASA astronaut.

Scott went up to space and lived there for 340 days

and Mark stayed on Earth.

Scott returned to Earth one year ago.

NASA is studying them to find out how being in space affected

Scott's body and compare it to Mark's on Earth.

This is what they have found out so far.

Scott grew around two inches in space.

His spine expanded because he didn't have the pull of Earth's

gravity on his body, but he went back to his

normal height soon after returning to Earth.

The twins have almost identical DNA and this decides

things like how they look.

The DNA is stored in something called a chromosome,

which looks like this.

Whilst Scott was in space, his chromosomes got longer

when you would expect them to get shorter, like his twin

Mark's on Earth.

Scientists are trying to work out what this means.

When Scott came back to Earth they found that his brain

was slightly slower than Mark's.

After a year in space he was taking a bit longer to respond

and solve problems in tests.

NASA wants to use the twins' information to help figure out how

to keep astronauts healthy if they ever send them

to Mars in the future.

OK, time for a quick round-up of some of the top sport stories:

It was a very good weekend for TeamGB at the European

Indoor Athletics.

They won seven medals on the final day.

Laura Muir became only the second Briton to win two individual events

at the games after adding gold in the 3,000 metres to the 1,500

metres title she took on Saturday.

To footie now and Spurs are seven points behind Chelsea at the top

of the Premier League after beating Everton 3-2.

It's their ninth home win in the league on the trot -

a new club record.

Harry Kane scored two and there was also a goal

from his England team mate Delle Ali.

Manchester City are one point behind Spurs after winning 2-0 at bottom

of the table Sunderland.

Sergio Aguero scored his 23rd goal of the season

and Leroy Sane added a second.

It's a fourth league win in a row for Pep Guardiola's side.

Some music lovers out there may have dreamed

of being on a TV talent show, but when Tom got a call

from Britain's Got Talent he decided to turn them down.

I went to find out why.

"Dear Simon and Britain's Got Talent, thanks for all your phone

calls and invitations to your TV talent show.

Sorry if my first answer wasn't clear enough,

but I don't want to be in this competition.

I sing songs and write songs for other reasons I can't

even put into words.

No need to phone me back as now everyone has seen this

so I could never come on your show without looking daft.

Yours sincerely, Tom".

When I was six-years-old I started getting music lessons.

Who inspires you?

I listen to quite a lot of James Bay.

He's just a really nice person and it's nice to see that people

in the music industry are nice people.

What do you think is brilliant about performing?

The reaction from the crowd.

When you get a good reaction from the crowd, it makes you feel

you can be yourself.

What do your friends think about the fact that you do this?

They don't really care, in fairness.

Whenever I'm trying to tell them about it, they will tell us to be

quiet because they think I'm being a bit big headed.

How did Britain's Got Talent get in touch and what did they say?

They rang us asking if I could do their show

and my first answer was no, then they rang us again

and we also said no that time.

Then the third time when they rang us we said no again.

I just feel that it wasn't a show that I wanted to do.

I didn't really want to take part in a music talent show

and I like what I'm doing at the moment.

I'm enjoying myself.

And why did you decide to write the letter?

We were getting a bit irritated by the fact they kept on ringing us

and it was just a nice way of letting them know that we didn't

want to be on the TV talent show.

What do you think of TV talent shows?

I don't think there is anything wrong with them, I just thought

that it wasn't really something that I wanted do.

I think it is important for me to do things my way

so I can feel like myself.

What are your hopes for the future?

Well, I'm just going to take it as it comes, to be honest.

I would love to, obviously, have music as my career,

but I'm just going to play the gigs that come and see how it goes.

That's all from me.

Newsround is back at 8.15am.

Head online for loads more great stories including the top tooters

of the conch shell blowing competition in Florida!