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one of the primary goals for the hubble

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space telescope when it was launched was

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to refine the measurement of the rate of

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the expansion of the universe and hubble

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has done that marvelously for us

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but a surprise came a few years ago

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scientists using hubble and also

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telescopes on the ground

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realize that the expansion rate of the

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universe is actually getting faster and

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as we look at very distant galaxies

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using these sensitive instruments we can

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tell that the universe expansion has not

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always been

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uniform toward the beginning of our

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universe's expansion it was decelerating

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so hubble is now being used to refine

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even further that expansion rate of the

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universe and trying to compare that to

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what might be predicted from looking at

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other measurements of the universe with

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other telescopes

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right now we're finding a discrepancy

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between what we might have expected and

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what we're actually measuring so that's

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one realm where hubble is really at the

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cutting edge of helping us understand or