Invisible alien probes “could already be” in our solar system

Fleets of robotic space probes from alien civilisations could already have arrived in our solar system, a mathematical study has found.

The study quotes scientists who warn  that we may not be able to detect them with our technology - the probes may also be so hi-tech they can “conceal” themselves.

Earth’s own Voyager probe has only just reached the edge or our solar system - but older alien civilisations could have launched probes long ago, using knowledge far beyond ours, "slingshotting" round stars using their gravity, according to a paper in the International Journal of Astrobiology.

Duncan Forgan and Arwen Nicholson of the University of Edinburgh analysed how a “fleet” of probes could travel through space  - and says that probes which “self-replicate”, building new versions of themselves from gas and dust in space, could have arrived here already.