Kerbal Space Program

To replicate:

1. Dock to a comet with a vessel that has one of the claws (full size or junior).

2. EVA a kerbal.

3. Have the kerbal rightclick the comet and take a surface sample.

4. Rightclick the comet again and pick "rename comet" and type a new name.

5. Repeat steps 3 and 4 as much as you like. Each surface sample counts as new.

You can stack multiple surface samples in your kerbal's science inventory this way. Come back home with the science, recover the vessel, and each duplicated surface sample counts for full credit. I will attach a screenshot showing what the recovery screen looked like when I did this.

I also will attach a savegame file that contains a vessel about to re-enter kerbin with a load full of about 28 of these duplicated surface samples I took from a comet. (In "comet just before re-entry".sfs, the relevant vessel is this one:

        VESSEL
        {
            pid = c02a2b333e72417c827ddb5c2471c5a8
            persistentId = 1356500004
            name = Vomit Comet
            type = Ship