Twelve of Jupiter's moons are relatively small and seem to have been more likely captured than to have been formed in orbit around Jupiter.
It is not definitive how the moons formed
It is correct because it doesn't say for sure how it was formed. it gives two options for how they may have been formed. I don't think the system understands this type of syntax
( z1 definitive :polarity - :domain ( z2 form :ARG1 ( z3 moon ) :manner ( z4 amr-unknown ) ) )