不知道不等于就是假的，不懂的东西先搜搜再发表意见好吧？

https://www.youtube.com/watch?v=We1HqGQRXkE

https://www.quora.com/How-did-the-American-flag-wave-on-the-moon

“There’s no air, no wind.

The flags were held out with a horizontal crossbar stretcher to make them stand out since it was well understood that if unaided they would hang lifelessly down.

I added a red arrow pointing at the end of the horizontal crossbar stretcher which is threaded through a hem sewn onto the top edge of the flag (you can see its puckered a little):