China will launch a big space telescope in 2023 to investigate distant galaxies

A colorful supernova remnant
A colorized image of Cassiopeia A based on data from the Hubble, Spitzer and Chandra space telescopes. (Image credit: NASA/JPL-Caltech)

China wants to launch its first large space telescope in late 2023 to survey the skies, deliver new insights about distant galaxies, and unlock the mysteries of dark matter and dark energy.

The Chinese Space Station Telescope (CSST) is an optical and ultraviolet space observatory that will boast a 6.6-foot-diameter (2 meters) lens, making it comparable to the venerable Hubble Space Telescope. Though the resolution of China's telescope will be similar to Hubble's, the CSST's field of view will be 350 times larger, Liu Jifeng, deputy director of the National Astronomical Observatories of China, told Chinese state-run outlet Xinhua, according to a statement

This means the CSST will be able to observe much greater expanses of the sky at a time than the 32-year-old Hubble, and will survey 40% of the sky with its 2.5 billion-pixel camera during the planned 10-year mission lifetime, according to documents from a group within the Chinese Academy of Sciences. 

Related: China's Shenzhou 12 astronauts send back stunning images of Earth (photos)

NASA, meanwhile, has launched its own successor to Hubble, the James Webb Space Telescope, which, for comparison, has a primary mirror with a diameter of 21.3 feet (6.5 m). 

The CSST will carry four additional instruments for mapping star-forming regions of the Milky Way, detecting fast-moving objects such as comets and asteroids, studying supermassive black holes, and directly imaging exoplanets.

The telescope is also known as "Xuntian," which translates to "survey the heavens." It will operate in a similar orbit as the country's Tiangong space station, allowing the telescope to dock with the outpost for repairs, maintenance and upgrades.

China plans to complete Tiangong by the end of this year, clearing the way for the launch of the space telescope a year later.

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Andrew Jones
Contributing Writer

Andrew is a freelance space journalist with a focus on reporting on China's rapidly growing space sector. He began writing for in 2019 and writes for SpaceNews, IEEE Spectrum, National Geographic, Sky & Telescope, New Scientist and others. Andrew first caught the space bug when, as a youngster, he saw Voyager images of other worlds in our solar system for the first time. Away from space, Andrew enjoys trail running in the forests of Finland. You can follow him on Twitter @AJ_FI.