BEIJING, May 25 (Xinhua) -- The three astronauts aboard China's Shenzhou-23 spaceship have entered the Tiangong space station and met with another astronaut trio on Monday, starting a new round of in-orbit crew handover.

The crews of China's Shenzhou-21 and Shenzhou-23 take group photos at the Tiangong space station on Monday morning. (Photo: Xinhua)

The Shenzhou-21 crew aboard Tiangong opened the hatch at 5:13 a.m. (Beijing Time) and welcomed the new arrivals, according to the China Manned Space Agency (CMSA).

The two crews then took group pictures for the eighth space get-together in China's aerospace history.

They will conduct handover work aboard the space station, the CMSA said.