Metallic spheres on Pacific floor are interstellar, Harvard professor finds

https://en.wikipedia.org/wiki/Shot_tower

https://graysci.com/chapter-two/make-your-best-shot/

Here is the paper linked in the piece

https://lweb.cfa.harvard.edu/~loeb/Interstellar_Expedition.p...

Note: That is not the Avi Loeb paper, but it is reported to have been submitted about his work.

A diary of that research trip is here

https://avi-loeb.medium.com/the-im1-spherules-from-the-pacif...

Related Wikipedia

https://en.wikipedia.org/wiki/CNEOS_2014-01-08

Oh it's Avi Loeb, head of the astronomy department at Harvard. Here's a youtube about what his deal is, by an astronomer who studied astronomy through postdoc level and then left for industry and doing some youtubes https://www.youtube.com/watch?v=aY985qzn7oI

I was gonna post a link to one of those helpful meteorite flowcharts, but then I realized that xkcd does it succinctly: https://xkcd.com/1723/