Robert Zubrin akakarakadza imwe nzira yokugadzira zvinhu zvine mvura ine nyukisi, roketi renyukireya rine munyu nemvura.
Chokwadika, shanduro yakaoma kunzwisisa zvikuru yemutsara wacho ndeiyi "Robert Zubrin akakarakadza imwe nzira yokugadzirwa kwechinhu chakanyoroveswa, roketi yenyukireya yemunyu-mvura, umo mvura iri mvura inoshanda uye mutarisiri weineutron. "