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Summary
One of the most fundamental and controversial measurements in cosmology, Hubble's constant (H0), informs scientists about how rapidly the Universe is expanding. The debate about the value of H0 has heated up recently as increasingly precise measurements from different techniques are converging on different values for H0. This discrepancy either means that the H0 measurements have systematic errors larger than astrophysicists can explain, or it reveals something profound about the physics underlying our universe. On page 1134 of this issue, Jee et al. (1) present a new way to measure H0, by combining information from strong gravitational lensing and the motion of stars within the lens galaxy, to calibrate supernova luminosities.
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