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If the aliens spent an entire year on the planet, conducting research for unobtanium, and didn't explicitly care about noninterference with the locals, it's quite likely that they have left some durable objects. These would be found, and although the locals won't be able to use it, they will be kept in temples as sacred reliques. They won't know, that the Gift of the Godys is nothing else, than a burned out gamma ray density meter, forgotten by a frustrated geologist.

Artifacts from modern alloys can easiely endure for 1000 years. Iron and bronze copies would also be made, and worn as amulett/used as decoration on home altars  .

EDIT: It's unlikely with such short and limited contact, but the natives could also pick up random phrases from the alien language, and use them as greeting, ritual cant or prayer. So if two natives meet, instead of saying 'Good evening' they would say 'The ore concentration in Probing Area 12 is below 0.02%, sir.' in some weird alien speech, believing that it means 'May the Gods of the Sky protect you!' in the sacred tongue.

If the aliens spent an entire year on the planet, conducting research for unobtanium, and didn't explicitly care about noninterference with the locals, it's quite likely that they have left some durable objects. These would be found, and although the locals won't be able to use it, they will be kept in temples as sacred reliques. They won't know, that the Gift of the Godys is nothing else, than a burned out gamma ray density meter, forgotten by a frustrated geologist.

Artifacts from modern alloys can easiely endure for 1000 years. Iron and bronze copies would also be made, and worn as amulett/used as decoration on home altars  

If the aliens spent an entire year on the planet, conducting research for unobtanium, and didn't explicitly care about noninterference with the locals, it's quite likely that they have left some durable objects. These would be found, and although the locals won't be able to use it, they will be kept in temples as sacred reliques. They won't know, that the Gift of the Godys is nothing else, than a burned out gamma ray density meter, forgotten by a frustrated geologist.

Artifacts from modern alloys can easiely endure for 1000 years. Iron and bronze copies would also be made, and worn as amulett/used as decoration on home altars.

EDIT: It's unlikely with such short and limited contact, but the natives could also pick up random phrases from the alien language, and use them as greeting, ritual cant or prayer. So if two natives meet, instead of saying 'Good evening' they would say 'The ore concentration in Probing Area 12 is below 0.02%, sir.' in some weird alien speech, believing that it means 'May the Gods of the Sky protect you!' in the sacred tongue.

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If the aliens spent an entire year on the planet, conducting research for unobtanium, and didn't explicitly care about noninterference with the locals, it's quite likely that they have left some durable objects. These would be found, and although the locals won't be able to use it, they will be kept in temples as sacred reliques. They won't know, that the Gift of the Godys is nothing else, than a burned out gamma ray density meter, forgotten by a frustrated geologist.

Artifacts from modern alloys can easiely endure for 1000 years. Iron and bronze copies would also be made, and worn as amulett/used as decoration on home altars