China's space agency is making final preparations to send a new crew to its space station on Thursday as part of its ambitious program that aims to put people on the moon by 2030.

The three-member crew of the Shenzhou-18 spacecraft will relieve the current team who have been manning China's Tiangong space station since last October.

China built its own space station after being excluded from the International Space Station, largely due to the United States' concerns over the People's Liberation Army's—the Chinese Communist Party's military arm's—involvement in the program.

NASA recently announced that it is seeking new ways to complete the return to Earth of rock cores drilled by the Perseverance Rover in the Jezero Crater on Mars. This has led to some anxiety among space scientists, who view the Mars Sample Return (MSR) mission as a cornerstone of plans to explore the solar system.

But when you consider what's at stake, scientifically and politically, it seems highly likely that NASA will push ahead with the mission to make it a success.

One key conclusion of the NASA review is that MSR was established with unrealistic budget and schedules. Now it expects a cost of US$8–11 billion (£6.5–8.9 billion), having originally estimated $5.3 billion. That's not including the investment that the European Space Agency (ESA) is making, which is probably of the order of €2 billion (£1.7 billion).