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Colour measurements of quasars are used to constrain the abundance and properties of intergalactic dust and the related extinction effects on high- z sources. For type Ia supernovae at z = 1, we derive an upper limit on the possible dimming from intergalactic dust of Δ m = 0.2, ruling out the `grey' dust scenario as being solely responsible for the observed faintness of high- z SNIa.
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A 2003 study studied this question.
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