I shall close today, appropriately, with a quote from China's endangered lunar rover Jade Rabbit (Yutu):

"I'm aware that I might not survive this lunar night."

"The sun has fallen, and the temperature is dropping so quickly... to tell you all a secret, I don't feel that sad. I was just in my own adventure story - and like every hero, I encountered a small problem."

"Goodnight, Earth. Goodnight, humanity."