Molecular Cloud or Galactus?

I saw an image of what is considered a "dark molecular cloud" of cosmic dust. Seeing this picture, I couldn't help thinking... what if the dark mass was actually an immense extraterrestrial swarm of nano-machines? It would be amazing & terrifying at the same time.

Molecular Cloud Barnard 68

This sentient cloud would be similar to the form that the Marvel character Galactus has been portrayed in Marvel Ultimate comics & the Fantastic Four: Rise of the Silver Surfer movie.

This precursors of interstellar nanotechnology are already being explored here on Earth.
• NASA is experimenting with tetrahedral forms in a primitive version of autonomous swarm technology.
• The University of Glasgow is taking it closer to the molecular scale by designing interacting devices comparable to dust particles, only millimeters across.

Innocent dust cloud or world-devouring hive mind?...
Hopefully we never have to find out.