Compact pebbles and the evolution of volatiles in the interstellar comet 2I/Borisov

The interstellar traveller, 2I/Borisov, is the first active extrasolar comet detected in our Solar System. ALMA and optical observations suggest that 2I/Borisov's home system, much like our own system, experienced efficient radial mixing from the innermost parts of its protoplanetary disk to beyond the frost line of corbon monoxide.