A Study of Hummus
They came to Earth to make first contact after picking up old radio signals. Then... they saw Earth and realized that might be a very bad idea at this time.
They'll still study humans & the area while they are here, though. Scifi devolves into postgraduate sitcom.
Brain Scan Sources
Yeah, humans don't have language for printing remote mind scans on a substrate. Golems? The originals are ignorant and unharmed.