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    http://filestore.aqa.org.uk/subjects...A-QP-JUN13.PDF

    http://filestore.aqa.org.uk/subjects...W-MS-JUN13.PDF

    part 2cii where it says s = r theta

    where has the value of s come from? the 1.2x10^10
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    s=1.2 \times 10^{10} as this is the Schwarzschild radius of the black hole in the centre of the milky way.
    This is calculated in the part above (2.b)
 
 
 
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