:00:00. > :00:07.Good afternoon, it's Jenny here with Thursday afternoon's
:00:08. > :00:10.Keep watching because we've got loads coming your way.
:00:11. > :00:15.Find out what Sir David Attenborough thinks.
:00:16. > :00:28.And dancers show off their moves in this CBBC flashmob.
:00:29. > :00:31.First, to some very exciting news in outer space.
:00:32. > :00:34.Astronomers in the United States say they may have
:00:35. > :00:37.discovered a brand new planet in our solar system that's about ten
:00:38. > :00:45.The solar system - it's 4.6 billion years
:00:46. > :00:47.old and made up of eight planets.
:00:48. > :00:54.But that could all be about to change.
:00:55. > :00:55.American astronomers say they have strong evidence
:00:56. > :00:58.that there is a new ninth planet orbiting the Sun -
:00:59. > :01:05.The mysterious world, nicknamed "Planet Nine",
:01:06. > :01:09.is thought to be gaseous and similar to Uranus or Neptune.
:01:10. > :01:12.The scientists have not observed the object directly yet,
:01:13. > :01:14.but say it's a planet because of the way other bodies
:01:15. > :01:32.By studies these rocks, we know how they should move. But they're not
:01:33. > :01:37.moving the way we expect. And the only explanation is another planet
:01:38. > :01:40.that is pulling on the objects and making them move differently.
:01:41. > :01:43.If it exists, Planet Nine would take between 10,000 and 20,000 years
:01:44. > :01:45.to complete one full lap around the Sun.
:01:46. > :01:51.The only thing left for astronomers to do now is track it down.
:01:52. > :02:00.We don't know exactly where it is. We are going to be scouring the
:02:01. > :02:02.skies to find it. Then we can study it.
:02:03. > :02:05.To tennis now and the Australian Open, where British number one,
:02:06. > :02:07.Johnanna Konta is through to the third round, after winning
:02:08. > :02:10.Andy Murray is also through to the next round.
:02:11. > :02:12.He beat Australian Sam Groth, in just 90 minutes.
:02:13. > :02:17.He'll now face Portugal's Joao Sousa.
:02:18. > :02:20.They stalked the earth hundreds of million years ago and scientists
:02:21. > :02:22.are constantly uncovering dinosaur fossils.
:02:23. > :02:25.But it's thought Sir David Attenborough has uncovered
:02:26. > :02:27.the world's biggest dinosaur for his latest documentary
:02:28. > :02:30.and he's told Newsround he believes there's a very small chance
:02:31. > :02:41.the prehistoric beasts could be brought back from extinction.
:02:42. > :02:51.A digital version of a dinosaur. But could this computer generated
:02:52. > :02:55.dinosaur become a reality. For David atborough, who was part of team who
:02:56. > :03:00.uncovered the bones of this creature, believes anything is
:03:01. > :03:06.possible. Do you think scientist could bring back dinosaurs? It is
:03:07. > :03:11.just possible that scientists could discover ways of doing so, if they
:03:12. > :03:16.did it would be, very... Expensive to do. He believes the money would
:03:17. > :03:20.be better spent looking after animals around today and there would
:03:21. > :03:30.be no space for them. Where would the poor old thing go? Where are you
:03:31. > :03:34.going to put him? We have enough problems keeping elephants alive.
:03:35. > :03:38.Where would you put a dinosaur? He believes the money would be better
:03:39. > :03:46.spent looking after animals alive today. But he was blown away by the
:03:47. > :03:53.discovery in Argentina. This is its thigh bone. They found over 200
:03:54. > :03:58.separate bones. We can be sure what the annal looked like. -- animal
:03:59. > :04:05.looked like. It was very big. So that was a real excitement to sea
:04:06. > :04:08.that. For Sir David discovering fossils is still exciting and he
:04:09. > :04:11.thinks there is so much more to find.
:04:12. > :04:13.Head over to the Newsround web site to see Sir David Attenborough's
:04:14. > :04:17.And you can find out more about the dinosaur fossils
:04:18. > :04:23.If you are a fan of CBBC show Taking the Next Step,
:04:24. > :04:26.or if you just like a bit of a boogie -
:04:27. > :04:29.200 dancers performed this fresh routine which was designed
:04:30. > :04:33.They all just started dancing at a shopping centre as part
:04:34. > :04:35.of the flash mob, which surprised a few people.
:04:36. > :04:38.There were all types of dancers from hip-hop to ballet taking part.
:04:39. > :04:41.It was filmed ahead of a new series of the show coming to CBBC later
:04:42. > :04:50.That's all from me, Newsround's back right here on CBBC tomorrow morning