The galactic distances used to measure the acceleration of the universe are determined by observations of
a) trigonometric parallax
b) line broadening
c) cepheid variable stars
d) exploding white dwarfs

A lot of galaxies are receding from the milky way galaxy. The galactic distances used to measure the acceleration of the universe are determined by observations of exploding white dwarfs.

Some observations has shown the evidence that the universe is accelerating.  This accelerating expansion result from observations of the brightness of distant supernovae.

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The answer is D

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