Sakashiro
The Martian Relic, yes.
I'd love it if there was more von Däniken-style storytelling in Elite, establishing some sort of link between Guardians, Thargoids and the origins of mankind. Unfortunately all such attempts never seem to go anywhere, with the Martian Relic being one such example. It was found, no one knows where it came from, The End.
My personal theory about the relic is that it might be some leftover Guardian technology, partly because it is an odd coincidence that the terraforming of Mars - a problematic subject considering the planet's lack of magnetic field - succeeded not long after said relic was found, and its size (about a thumb, if I recall correctly) seems about right for some kind of data storage device.
But I'm not sure that is what the Titan might be heading to Sol for. Unless the Feds have been hiding it all along that they actually found much more than just the small relic on the planet, but hidden beneath the surface.
(It would surprise me that, if the Guardians did discover Sol, they didn't develop some interest in studying the native ecology, and perhaps they were eyeing up Mars before they were wiped clean off the galaxy by their AI. If such information is present within the Guardian network Ram Tah's been quite quiet about it, however.)
Also, unrelated, but did Frontier reduce how visible the Titan flare while it's moving is? Before you could see those things clearly from over a hundred light years away, yet I can't seem to see it now even in the system it passed last night, and the one it is currently heading to. Trying to determine if my stupid game caught a case of bug-itis.