:00:00. > :00:00.Hello - it's Ayshah here with Newsround on TV and online
:00:00. > :00:10.We've got the latest on a massive discovery by scientists
:00:11. > :00:23.Scientists have just announced that they've made an incredible discovery
:00:24. > :00:27.that will help us fully understand gravity.
:00:28. > :00:31.Because of the force of gravity if you drop something it falls down
:00:32. > :00:40.Now for around 100 years, scientists have had ideas about how
:00:41. > :00:41.gravity might change in space and create
:00:42. > :00:46.Now a US team has been able to prove that those theories are true.
:00:47. > :00:53.Black holes - the strangest objects in the universe.
:00:54. > :00:57.They don't have a surface like a planet or a star and can't be
:00:58. > :01:00.seen, but scientists know they're there because of the way they move
:01:01. > :01:03.Now a group of researchers watching them in space,
:01:04. > :01:05.think they've made one of the biggest discoveries
:01:06. > :01:13.In a galaxy far, far away, two black holes smashed together
:01:14. > :01:21.But it's only now that the shock waves have reached Earth.
:01:22. > :01:28.When you consider that these black holes actually spiralled out over a
:01:29. > :01:33.billion years ago and the signal has been travelling to us since then and
:01:34. > :01:36.we turned on our detectors at just the right time to detect arrive.
:01:37. > :01:39.This is a model of what the scientists actually found.
:01:40. > :01:41.First two black holes spin towards each other.
:01:42. > :01:43.As they get closer they give off waves of gravity,
:01:44. > :01:46.which is a force that attracts things towards each other.
:01:47. > :01:49.These waves get stronger and stronger until the black
:01:50. > :01:57.Professor Stephen Hawking is one of the world's most famous
:01:58. > :02:02.He says that the discovery is a special moment in the history
:02:03. > :02:14.Gravitational waves provide a completely new way of looking at the
:02:15. > :02:16.universe. The ability to detect them has the potential to revolutionise
:02:17. > :02:18.astronomy. By scanning the skies,
:02:19. > :02:23.astronomers can use these waves to find black holes,
:02:24. > :02:26.things that have been completely invisible
:02:27. > :02:29.to the telescopes until now. Scientists hope this will open up
:02:30. > :02:32.parts of the universe that they've Today we've been asking
:02:33. > :02:41.for your opinion on pocket money, It's all because new research has
:02:42. > :02:46.found that most of you get it Some people think that's a bad idea
:02:47. > :02:51.because pocket money can be a good way of helping kids learn
:02:52. > :02:53.important life skills. So we've been asking what you do
:02:54. > :02:56.to earn pocket money. Ayran from Watford says,
:02:57. > :02:58."I play the guitar to earn my pocket money and I think it's wrong that
:02:59. > :03:01.people just get it free." Izzy who lives in Shrophire told us
:03:02. > :03:04.some of the things she does "I have to vacuum the house,
:03:05. > :03:08.do the dishes, empty Megan from Buntingford
:03:09. > :03:12.in Hertfordshire says, "I think
:03:13. > :03:14.we should work for pocket money, because otherwise it's just
:03:15. > :03:21.like we get a present every week." Now to a classroom
:03:22. > :03:24.with a difference. in Bradford in West Yorkshire have
:03:25. > :03:29.been taking part in a special experiment to help them
:03:30. > :03:31.keep fit and healthy. They're the first in
:03:32. > :03:36.Europe to try it out. Can you spot the difference
:03:37. > :03:38.in this classroom? Here in this class, it's
:03:39. > :03:48.all about...standing. It's part of an experiment to see
:03:49. > :03:51.if standing throughout the day, instead of sitting down,
:03:52. > :03:53.helps improve your health by keeping you more active,
:03:54. > :03:57.so how does it work? To go up, you push this
:03:58. > :04:02.lever and it goes up. To go down, you hold the lever
:04:03. > :04:05.and you push on the top of the desk. When you're standing up,
:04:06. > :04:13.you've got to put your chair to one side and then you put it
:04:14. > :04:18.to the right height by making an L-shape with your elbow
:04:19. > :04:21.and adjusting the height. The results of the tests so far have
:04:22. > :04:24.shown students spend less time What do these guys think
:04:25. > :04:28.of their standing desks? They are more relaxing
:04:29. > :04:32.than when we had the normal desks. They are really awesome
:04:33. > :04:35.because you can stand up or down on them so you don't have to just
:04:36. > :04:38.sit down all the time The stand-up sit-down desks
:04:39. > :04:46.are popular with this class and researchers hope
:04:47. > :04:48.to bring their idea to other schools Hayley will be here at
:04:49. > :04:57.7.40am tomorrow morning.