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What has Hubble helped to reveal about the expansion of the universe?

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One of the primary goals for the Hubble space telescope when it was launched

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was to refine the measurement of the rate of the expansion of the universe.

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And Hubble has done that marvelously for us.

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But a surprise came a few years ago, scientists using Hubble and also telescopes on the ground

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realized that the expansion rate of the universe is actually getting faster.

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And as we look at very distant galaxies using these sensitive instruments we can tell that the

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universe expansion has not always been uniform.

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Toward the beginning of our universe's expansion it was decelerating now it's accelerating.

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So Hubble is now being used to refine even further that expansion rate of the universe,

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and trying to compare that to what might be predicted, from looking at other measurements of the universe

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with other telescopes.

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Right now we're finding a discrepancy between what we might have expected and what we're actually measuring.

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So that's one realm where Hubble is really at the cutting edge of helping us understand

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or at least open up new mysteries of the universe.

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