The ongoing debate over the universe's expansion: new insights and measurements.

Researchers have made a third, independent measure of the Universe's expansion by tracking the behavior of a gravitationally lensed supernova. The Hubble constant is a measure of the Universe's expansion, and there are two different measurements that differ by about 10 percent. The new work involves a third way to measure the distance that's independent of the other two, relying on gravitational lensing. The new measurement provides a third estimate of the Universe's expansion, which could help resolve the discrepancy between the other two measurements.