This explains it

Their new flag? pic.twitter.com/HKVHXDyW35

— JJ MacNab (@jjmacnab) August 9, 2018

Since that might be a little obscure, it’s the official flag of the Космические войска России (Russian Space Forces)

— JJ MacNab (@jjmacnab) August 9, 2018

I believe they are the only country that does have one.

— JJ MacNab (@jjmacnab) August 9, 2018