01/06/2016 Newsround


01/06/2016

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Hey, everyone.

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Martin here with the big stories this Wednesday.

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First, the world's longest and deepest train tunnel has

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officially opened in Switzerland.

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It's taken 17 years to build the Gotthard tunnel, which goes

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for 57 kilometres under the Alps.

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And today, fireworks greeted the first trains.

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The tunnel gives a high-speed rail link between Northern

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and Southern Europe.

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It's more than two kilometres under the mountains at its deepest point.

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Now to something else that's massive -

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the Square Kilometre Array project.

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When it's finished, the radio telescope will be the most powerful

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in the world and be able to search further into space than ever before.

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And there's one big question scientists hope it will

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help us answer.

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Here's Ayshah.

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Aliens.

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Are they really out there?

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And, if so, are we ever going to find them?

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The universe is vast.

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Our solar system is one of the solar systems around a sun,

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which is one of the millions of stars in our galaxy.

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Our galaxy is one among the millions of galaxies

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in the universe.

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So, why not?

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Maybe there is life somewhere in another solar

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system in another galaxy.

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That is what scientists are trying to find out

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with the help of these.

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This is the Square Kilometre Array project.

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When it is finished, it will be the world's most

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powerful radio telescope, so sensitive that it will be able

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to detect a signal from a planet that is tens of light years away.

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These telescopes are listening for intelligent life

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and that is why they have decided to build them here.

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What makes this place in South Africa perfect

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is that there is no radio waves around to mess up the signal.

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That's no microwaves, no mobile phones -

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I've had to turn mine off.

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Every day, these dishes are collecting massive amounts

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of data, which will eventually be processed by a supercomputer

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in the UK where experts will look for any signs of life.

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How do you go about looking for alien signals?

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Well, you have got big telescopes like that and they can go listen

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in the universe and listen for radio signals from other planets

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where we hope they also have radio signals and maybe we can detect

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some of these signals.

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How would we know that an alien has tried to contact us?

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We are looking for intelligent signals, signals that are not

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from nature but that are made by intelligent creatures.

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Will we ever be able to find an alien?

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I certainly hope so.

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I hope to find them once in my lifetime.

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It would be such a big discovery.

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But it could be very long and it could also take very long

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to communicate with them because the signals take maybe years

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to go to the civilisation and also take years to get back,

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so one simple question and answer could take, like, 40 years.

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Of course, there's no guarantee that other civilisations exist

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beyond our world, but, if they do, it might not be long before

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SKA finds them.

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From searching for aliens to searching for pop stars -

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X Factor bosses have just announced this year's "new" judging line-up,

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which they hope will help save the show from years

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of falling ratings.

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Ricky's got this.

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The all-new X Factor is actually...

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pretty old.

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Faces from the past are returning to search for a new star.

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Louis Walsh, Sharon Osbourne and Nicole Scherzinger

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rejoin Simon Cowell.

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Don't forget, Dermot's back, too.

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To be honest, it feels like we've gone back in time to the old school.

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That's because all these judges have featured on the show before.

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Sharon and Louis launched a series more than ten years ago and singer

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Nicole became a judge in 2012.

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Today, ITV released this pic to get us all excited about the new series.

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Yep, that's four chairs with the names on the back.

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I'm sure you can all hardly contain your excitement.

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So can these familiar faces bring back a bit of familiar sparkle

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to The X Factor?

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And you can tell us what you think about this year's line-up over

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at Newsround online.

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That's all from the TV team today.

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Ayshah's back tomorrow morning.

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See ya!

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