Hubble Constant
This illustration shows the three steps astronomers used to measure the universe's expansion rate to an unprecedented accuracy, reducing the total uncertainty to 2.4 percent. - Click here to find out more about the three steps
Credits: NASA, ESA, A. Feild (STScI), and A. Riess (STScI/JHU)
Image CreditNASA, ESA, A. Feild (STScI), and A. Riess (STScI/JHU)
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