L'article en anglais:
Crystalline Boron A NASA scientist says a film of boron-11 can be used to power a boron-carbon fusion reactor, whose radioactive decay can be harnessed to provide thrust for a deep-space vehicle.Wikimedia Commons
http://www.popsci.com/technology/article/2011-06/fusion-thruster-puffing-alpha-particles-could-drive-future-deep-space-probes
C'est une histoire de fusion où pas beaucoup de matière (rare ?) permets d'aller loin =)
Je cite: Boron is abundant on the Earth, and if a few grams of the stuff can drive a spaceship to Mars and beyond, it’s an idea worth studying, at the very least.