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helpcometk
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Homework Statement
Hubble's law may be written as
H0dL = z +(1/2)(1 - q0)z2
Working to O(z) only, what is the redshift of a galaxy at a luminosity distance of 100 Mpc
from Earth?
What is the role of the constant q0? Given that observations show that q0 = -0.77,
calculate the luminosity distance (in Mpc) of a high redshift supernova with z = 0.5.
Homework Equations
the first question is what O(z) might mean and second if i make the substitution ,q0 which is given later i get a quadratic equation with imaginary solutions.The second part is just a metter of calculations i suppose ,but it seems that for the first question I am missing something.