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Australian Researchers Use Neutron-Star Merger, Measure Hubble 244,000

7/11/2026

Summary

Story summary

Australian researchers reported a new Hubble-Lemaître Constant measurement from a binary neutron-star merger.
Combining radio, Hubble astrometry and gravitational-wave data, they derived a value near 244,000 km/h per megaparsec, versus the 252,000 km/h per megaparsec distance-ladder figure.
Lead author Dr Kelly Gourdji said the result suggests the tension is unlikely due to a theory flaw.
Swinburne Professor Adam Deller noted months-long jet emission supplied the radio data, published in The Astrophysical Journal.

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Story summary

Australian researchers reported a new Hubble-Lemaître Constant measurement from a binary neutron-star merger.
Combining radio, Hubble astrometry and gravitational-wave data, they derived a value near 244,000 km/h per megaparsec, versus the 252,000 km/h per megaparsec distance-ladder figure.
Lead author Dr Kelly Gourdji said the result suggests the tension is unlikely due to a theory flaw.
Swinburne Professor Adam Deller noted months-long jet emission supplied the radio data, published in The Astrophysical Journal.