Astronomers Confirm Unique Triple-Star System Configuration
Researchers identified a millisecond pulsar orbiting with a white dwarf and a sun-like star 7,000 light years away.
Updated on Oct. 23, 2026 in Space
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Astronomers have confirmed the existence of a rare triple-star system consisting of a millisecond pulsar, a white dwarf, and a sun-like star located 7,000 light years from Earth. The system structure was identified after researchers analyzed data from the FAST telescope and 18 years of gamma-ray observations.
Why it matters
The system serves as a critical laboratory for testing the strong equivalence principle within Einstein's theory of gravity. Researchers began searching for a third stellar body after observing the pulsar spinning 100 times faster than expected, indicating an external gravitational influence.
The system includes a pulsar that spins over 300 times per second and orbits a white dwarf every eight days, while a sun-like star circles the pair every 73.5 years. Data was synthesized from FAST radio telescope findings and 18 years of Fermi telescope gamma-ray records.
The players
FAST Telescope
Located in southwestern China, the Five-hundred-meter Aperture Spherical Telescope is a major instrument for deep space radio observations.
Fermi Space Telescope
This space observatory monitors gamma-ray activity to help scientists understand extreme high-energy phenomena in the universe.
Xinjiang Astronomical Observatory
This facility based in Xinjiang is a key research center contributing to the National Astronomical Observatories of China.
The details
The pulsar, which originated from a star roughly 20 times the mass of the sun, is tugged by the gravitational pull of the companion stars. This interaction creates the irregular spin rate that alerted astronomers to the presence of the third star.
Timeline
The FAST telescope first spotted the pulsar in 2020.
A research team from Xinjiang published their findings in Nature Astronomy in April 2026.
A European research team independently published their results online in July 2026.
The latest findings were formally reported in The Astrophysical Journal Letters in October 2026.
The Big Picture
This discovery allows scientists to rigorously test Einstein's strong equivalence principle, which remains a cornerstone of modern gravitational physics. By observing how this complex three-body system interacts, researchers can probe for subtle deviations from theoretical predictions.
This breakthrough improves our fundamental understanding of gravitational physics and the life cycles of massive stars. Such research refines the theoretical models that underpin our broader knowledge of the universe's mechanics.
The takeaway
This discovery highlights how massive star systems can produce complex gravitational environments that defy standard observations. Astronomers rely on these rare cosmic configurations to verify the foundational laws of physics that govern our universe.
What happens next
The sun-like star in this triple-star system is projected to reach its closest orbital proximity to the pulsar and white dwarf pair in 2036.
Further reading
Learn more about the latest findings in Space.
Source note: This article includes information reported by South China Morning Post.
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