• Question: What is a black hole?

    Asked by BossBob1234 to Chloe, Irene, Pierre, Ricardo, Uday on 16 Nov 2015.
    • Photo: Uday Bangavadi

      Uday Bangavadi answered on 16 Nov 2015:


      Black hole is a region in space time with huge gravitational force. Its force of attraction is so huge nothing can escape from it, not even a particle or even Electromagnetic wave.

    • Photo: Irene Regan

      Irene Regan answered on 16 Nov 2015:


      Great Q:)

      What are black holes?
      Have you ever had to vacuum your bedroom?
      When you do, watch closely because you will see the dirt and crumbs start to move towards the vacuum cleaner. A black hole is similar to a vacuum cleaner, cleaning up debris left behind in outer space.

      However, it is not suction power that makes things fall into a black hole. Suction would not be strong enough. Instead, a black hole uses the power of gravity to pull things towards it.

    • Photo: Pierre Casaubielh

      Pierre Casaubielh answered on 17 Nov 2015:


      Its definition has been provided by the others.

      It is difficult to explain their origin…

      Questions come with it: why are there some? could it be useful to something?
      The question you ask about it, a lot of scientist ask and will ask for a good while the same questions (it is not because we are scientist we have all the answers). I can see you have a mind of scientist: asking very good question!
      There are plenty of books and papers to read, maybe you will the clues?

    • Photo: Ricardo Segurado

      Ricardo Segurado answered on 17 Nov 2015:


      A black hole used to be a star. In fact a really big type of star, bigger than the sun by a long way. We wouldn’t want to be on a planet around that type of sun.

      These stars are so big and heavy, that they have very strong gravity, and pull a lot of matter into them, from space.

      You probably know that stars are made out of constant nuclear explosions. In the biggest stars the explosions are trying to blast the star apart, and the gravity is trying to keep the star together. But if the star is big enough, then, when it gets older and the explosions slow down, gravity takes over, and pulls the whole star inwards.

      You then get a tiny tiny star, just as heavy as it was before, but because it’s so small now, nothing can escape from it. Not even light – that’s why we call them black holes. You don’t want to go anywhere near them, because the gravity is so strong!

    • Photo: Chloe Huseyin

      Chloe Huseyin answered on 17 Nov 2015:


      A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because no light can get out, people can’t see black holes. They are invisible.

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