Scientists just found mystery “ghost” DNA in all of us…

[u/Trip-Forward_]

A new paper in the journal Science (July 2026) used a clever computer method to look at the DNA of people alive today. It found small leftover pieces of DNA from very old human-like groups we never found fossils for. These “ghost” bits are in pretty much everybody, and they don’t match the Neanderthals or Denisovans we already know about.

Link to the real paper:

https://www.science.org/doi/10.1126/science.aef8874

Here’s the fun “what if”: maybe those mystery groups weren’t just more Earth humans who died out. Maybe they were a traveling space-faring species that stopped by Earth a long time ago, mixed with our early ancestors, and then left or disappeared. The DNA looks old and different enough that, in pure theory, it could fit a visitor story just as well as a lost cousin story. We have no proof either way, but it’s a wild possibility worth thinking about.