Sort:  

Correct me if I'm wrong, but wouldn't 1.000.000.000.000.000 hydrogen atoms weigh ~1.6 nanograms? I can't even detect regular matter that small.

Yes this is correct. We are dealing with macroscopic weights (1 ng is roughly speaking the weight of a single human cell) attached to elementary particles. So it is really huge!

Also, awesome to hear that Argentina has a world-reknown observatory.

A unique observatory that has been built to be the best in the world for this kind of physics.