Is there a limit on the # of artifacts you can have?

Or possibly a bug where if someone raids you and steals one, you do not get a report?

My issue:

Twice now, a good artifact has come up missing. normally, I wouldn't notice but one was a "terraforming device" and the second was the one that makes your planet grow in size by 1 (I don't remember its name).

I am positive that I didn't use either of them. When the terraforming device dissappeared a week or so ago, I thought possibly, just possibly it could have been something I did. Was pretty sure no. The second time around I am of the opinion that it is too much of a coincidence.

It could be you did a mission that uses the said artifacts. Those two artifacts I think cannot be stolen by anyone

if you did the Terra Project or the Collosal Project those artifacts would be used(but trust me, the reward for completion of those missions are WORTH it, ask if you want a spoiler)there are others that dont use artifacts that are AS good as Terraformer and Quasi-Spacial Expander, such as Biological Warfare that uses Enginneered Viruses

And what could be more worth then making your planet sucky to 15x mega rich?

Didn't use them. Those mission are still not started.

Figured I wouldn't start it until I had all the necessary terraformers. Only had 1... But now zero.