• Question: why is there gravity?

    Asked by cjay_is_not_here to Simon, Julia, Delma, Andrew, Alex on 10 Dec 2015. This question was also asked by enya kneeshaw.
    • Photo: Andrew Winnard

      Andrew Winnard answered on 10 Dec 2015:

      Hi Cjay, this another awesome physics question!

      Here is a video that tries to explain things for you:

    • Photo: Simon Challis

      Simon Challis answered on 10 Dec 2015:

      Hey cjay_is_not_here!

      I think Andrew nailed it! But I have my own question about gravity that I need an astronomer or a cosmologist to answer…. If the speed of gravity is not infinite as Newton assumed but rather equivalent to the speed of light, how is it possible for super huge structures like galaxies to form which are hundreds of thousands of light years across? Anyone wanna answer that for me?

    • Photo: Alexander Finch

      Alexander Finch answered on 11 Dec 2015:

      Oh wow, that’s an almost philosophical question! I don’t think anyone knows why there is gravity. We know a lot about it and how it works, but not where it comes from really. Lots of scientists are trying to work it out!