Go/no-go for a Mars samples return

Last month's return to Earth of China's lunar lander Chang'e-6 with samples from the far side of the Moon is a reminder that there are "firsts" in robotic space exploration still to be achieved. Unfortunately, this year has seen a major setback for the prospects of an even more extensive plan to collect samples from Mars. In April, the US National Aeronautics and Space Administration (NASA) made clear that the ballooning cost for the US Mars Sample Return mission to around $11 billion was too much and the 2040 return date was too distant. NASA has been told to look for ideas to lower costs and shorten the timeline. Shock and anger are palpable in the astronomy community.