Hello, could you please help me with this question:A hypothetical object is observed within the field of view of another galaxy cluster, which is known to be at a distance of 700 Mpc. The wavelength of the spectral feature observed in part (a)(see attachment) at 589 nm in the laboratory is found to be 919 nm for this object, rather than at 683 nm for the other objects in this cluster.Without doing any calculations, explain why we can state with confidence that this object is not part of this cluster, and is actually more distant and calculate its apparent brightness if it were actually part of the cluster. The object is observed to have an apparent brightness of1.2 × 10−11 W m−2.(Show all of your working)
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