China’s FAST telescope finds the lightest known neutron-star pair
Space · Saturday, October 3, 2026 · 7 sources

China’s FAST telescope finds the lightest known neutron-star pair

China’s FAST telescope has identified PSR J1856−0039, a neutron-star pair with a combined mass of 2.488 times the Sun’s and an orbit lasting 2.36 hours. Researchers say its orbital decay matches general relativity’s prediction, making the system a useful test of gravity and a rare window into the physics of dense matter.

Bottom line — The pair is expected to merge in about 82 million years, probably forming a heavier neutron star.

Go deeper 6

  1. China Daily and People’s Daily report that the pulsar weighs about 1.30 solar masses and its companion about 1.19.

  2. Phys.org says researchers observed the system in 17 FAST sessions from 2020 to 2025, measuring the arrival times of 253 pulses.

  3. The 2.36-hour orbit is the second-shortest known among confirmed double neutron-star systems, according to China Daily.

  4. Phys.org reports that the team measured three relativistic effects, including the orbit’s gradual shrinkage and the turning of its closest point.

  5. Han Jinlin told China Daily that only one or two known systems appear promising for measuring frame dragging.

  6. The researchers plan long-term monitoring to investigate the pulsar’s internal structure; Phys.org says the work could take about 10 years.

Read the reporting 7

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Last generated: Oct 3, 1:42 PM UTC by wreetco

dstld. Your daily news summary designed to surface the news that matters from a European perspective. Curated by humans, summarized by AI - always with links back to the original reporting.

Links · Contact
Popular topics · WorldEuropeGamesAI
Last generated: Oct 3, 1:42 PM UTC by wreetco