A recent study submitted to Acta Astronautica and currently available on the arXiv preprint server explores the potential for using aerographite solar sails for traveling to Mars and interstellar space, which could dramatically reduce both the time and fuel required for such missions.
https://dictionary.cambridge.org/us/dictionary/english/fathead
In common North American usage “fat head” and “big head” imply hubris or pride, as well.