https://www.bbc.co.uk/news/science-environment-62333546"Designing objects to disintegrate upon atmospheric re-entry is becoming a priority for satellite operators. It's done partly by using materials which have low-melting point temperatures, such as aluminium.In the case of rockets, this can be expensive, as historically the materials used for housing fuel, such as titanium, require very high temperatures to burn up. The sheer size of such objects is also an issue, especially in the case of the Long March 5, weighing over 25 tonnes."Expensive?
The small 5-metre-long robotic arm on Wentian has passed on-orbit testing. Will next connect with the 10m arm on Tianhe for further testing, CMSA says. Some great views in the video below. Source [CMSA]: m.weibo.cn/detail/4798304…
If Mengtian is lost in a launch failure, are they able to maintain the Tiangong station with just one experimental module (Wentian, in this case)?