For the record, here's the
translated JAXA release:
The table (in Attachment #1) contains the evidence they're basing their conclusions on.
They appear to have excluded Earth based origins on the basis outlined in the bullet point in the table.
Fair enough.
It took a while … but we got there in the end.
I still look forward to a paper on the subject, though .. what does it all mean ? I think they're going to use their 8GeV accelerator to smash a few particle up and find out the structure/composition ..
Cheers