They did not have the pallet removed in time to put it on the departing JAXA HTV cargo spacecraft, which has some control over where it burns up. It would not fit on any craft operated by NASA. (I haven't checked if it would fit into a cygnus, but I doubt it)
"Jettisoning" things from the ISS is actually pretty straightforward, you just drop or throw it out the back (aft) and its orbit should decay faster than your spacecraft. (IIRC, you really don't want to throw it straight down) JAXA has an airlock that takes great advantage of this for launching cubesats.
"Jettisoning" things from the ISS is actually pretty straightforward, you just drop or throw it out the back (aft) and its orbit should decay faster than your spacecraft. (IIRC, you really don't want to throw it straight down) JAXA has an airlock that takes great advantage of this for launching cubesats.