Alien probes could already be hiding somewhere in our Solar System – and our current surveys are nowhere near good enough to rule them out, according to a NASA‑linked study presented this month by astronomer T. Joseph W. Lazio.
The work, outlined at the Proceedings of the IAU Centenary Symposium in the United States, argues that even if an advanced civilisation had sent robotic scouts into our cosmic backyard, today's instruments would almost certainly miss them. Lazio, a senior scientist at NASA's Jet Propulsion Laboratory, sets out where such probes might lurk and why they would be so hard to spot.
