Core Viewpoint - Chinese scientists have discovered a rare millisecond pulsar using the FAST telescope, which orbits another star and is obscured for one-sixth of the time by its companion star. This discovery is significant for the study of stellar evolution and gravitational wave sources in binary star systems [1]. Group 1 - The discovery involves a unique binary star system that is extremely rare and difficult to observe [1]. - The research findings were published in the international academic journal "Science" on May 23 [1]. - The study has important implications for understanding stellar evolution and gravitational waves within the Milky Way [1].

Core Findings - A rare millisecond pulsar has been discovered based on observations from the "Chinese Sky Eye" (FAST), which orbits a companion star every 3.6 hours, with periodic eclipses lasting 0.6 hours [1][2] - This discovery is significant for understanding stellar evolution theories, compact star accretion physics, and gravitational wave generation mechanisms [1] Group 1: Discovery Details - The discovered pulsar, PSR J1928+1815, has a rotation period of 10.55 milliseconds and was confirmed to have a companion star after six months of tracking [1] - The companion star is unusually massive, comparable to the Sun, but has a very small orbit of only 500,000 kilometers, which is not typical for eclipsing pulsar companions [2] Group 2: Scientific Implications - The findings validate the theory of common envelope evolution in binary star systems, enhancing the understanding of how stars interact and exchange material [2] - The companion star may have accumulated significant material during the common envelope phase, providing insights into neutrino cooling mechanisms [2] - This unique binary system could eventually evolve into a source of gravitational waves, offering new clues for studying gravitational wave generation [2]