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To be fair to rocks, we also study them ...

Is astrogeology (as etymologically oxymoronic as that is) already a subject?

That's basically what asteroid science is. It's such a big field that we're even sending probes to collect rocks.

Maybe aliens will be interested in Earth for Astrogastronomy.

Sorry, no - only the consumption of cultivated humans is allowed.

How would you know that you are being cultivated?