Satellite is king of the skies with another 2 years service ahead
Print Edition
China鈥檚 Dark Matter Particle Explorer, nicknamed 鈥淲ukong鈥 or 鈥淢onkey King,鈥 will extend its service in space by two years, as it is still in good condition and collecting key scientific data.
The research team operating the satellite said yesterday that Wukong鈥檚 key performance indicators have barely changed compared with three years ago when it was launched as China鈥檚 first dark matter probe satellite.
As of yesterday, the satellite has reached its expected service life of three years, having orbited the Earth 16,597 times in a sun-synchronous orbit at an altitude of 500 kilometers, detecting around 5.5 billion cosmic particles.
鈥淲e hope that Wukong鈥檚 鈥榮harp eyes鈥 will detect 300 electrons that are obviously different from the normal energy spectrum by the end of 2019, which will provide theorists with sufficient data to study the nature of the electrons,鈥 said Chang Jin, chief scientist of the team.
Chang said the research team is quite confident about the satellite working another two years in space.
China launched Wukong at the end of 2015 to detect high-energy electrons and gamma rays in space, which may be generated in the process of annihilation or decay of dark matter.
The satellite鈥檚 original objectives have been completed with some results exceeding expectations, according to the team.
In 2017, the British scientific journal Nature published the high-energy electronic data collected by Wukong in the 18 months after its launch.
In the study, Chang found an unexpected surplus of high-energy electrons that might be caused by the annihilation of dark matter, attracting close attention from domestic and foreign scientific communities.
鈥淜ey data is still being accumulated, the extension of Wukong鈥檚 service is the basis of all our research,鈥 said Guo Jianhua, deputy chief designer of the satellite payload.
Compared with the existing dark matter detection equipment in the world, Wukong boasts advantages in its range of energy observation and its energy resolution.
Dark matter is a hypothetical form of matter that is thought to account for around 80 percent of the matter in the universe.
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