The three astronauts, the first crewmembers to visit Tianhe, have been aboard the module since June 17. The crew have completed two extravehicular activities (EVAs), or spacewalks, and carried out a range of experiments, but China's human spaceflight agency has only recently released images taken by the astronauts.
A first batch of images taken by Tang Hongbo and released in August include views from space of the Gulf of Guinea, lights illuminating north Africa, the Ethiopian Highlands and Indian Ocean, as well as Tang's sleeping quarters. Shenzhou 12 commander Nie Haisheng also sent back images of Beijing at night and a section of the Pacific Ocean.
One image shows a curve of light above the Earth. This is created by light passing through sodium atoms in the atmosphere at around 50 miles to 65 miles (80 to 105 kilometers) above Earth's surface.
Other images provide a first glimpse at the windows on Tianhe, as well as a look at the solar panels that provide electrical power for the orbital facility. The photo of Tang's sleeping quarters shows the sleeping bags that keep the astronauts secure in microgravity while they doze.
A second batch of images released on Sept. 8 include pics snapped by astronaut Liu Boming. These include Lake Urmia in Iran, China's Kizilsu Kyrgyz Autonomous Prefecture, Lake Van in Turkey and the Armenian highlands, and a view of South Africa.
Reports did not specify the equipment used by the astronauts to capture the images.
The Shenzhou 12 astronauts are preparing for a return to Earth sometime in mid-September. The crew will engage in adaptive physical exercises, clean EVA suits and carry out a spacecraft radial rendezvous test before returning home, according to CGTN.
The radial, or R-bar, rendezvous will see the Shenzhou 12 spacecraft approach Tianhe from a direction perpendicular to the Earth, instead of along the line of Tianhe's flight path. Shenzhou 12 will also circumnavigate Tianhe as a further test in preparation for October's Shenzhou 13 crewed mission.
Shenzhou 12 is the third of 11 planned missions to construct the three-module Tiangong space station.
A Long March 7 rocket is currently being prepared to launch the fourth mission, the Tianzhou 3 cargo spacecraft, in mid- to late September. Shenzhou 13, which has been readied in case of emergency, is scheduled to launch from Jiuquan to Tianhe in October with a second three-person crew.
Follow us on Twitter @Spacedotcom and on Facebook.
Live Science newsletter
Stay up to date on the latest science news by signing up for our Essentials newsletter.
Andrew is a freelance space journalist with a focus on reporting on China's rapidly growing space sector. He began writing for Live Science sister site Space.com in 2019, and he also 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.