NASA's Hubble Space Telescope has calibrated more than 40 "milepost markers" of space and time over the course of the last 30 years that scientists are using to measure the expansion of the universe.
NASA's Hubble Space Telescope has calibrated more than 40 "milepost markers" of space and time over the course of the last 30 years that scientists are using to measure the expansion of the universe.
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