This NASA animation shows something one could mistake for blue blood pumping in an alien venous system

Alien it most certainly is not. But the word 'venous' is not far from the mark. So just what is this thing anyway?
When I first spotted this mesmerizing animation on Twitter, my mind really did wander to the metaphorical idea of blood flowing through some sort of alien venous system.And actually, to the extent that a river can be the lifeblood of a region, you are looking at something akin to a venous system.The time-lapse animation consists of 14 false-color satellite images of the