That would make a lot of sense. "Sonnenstoff", with an extra "n", probably; it rolls of the tongue more easily. Zeppelins are also called "Luftschiff", airship

That would make a lot of sense. "Sonnenstoff", with an extra "n", probably; it rolls of the tongue more easily. Zeppelins are also called "Luftschiff", airship (giving rise to the usual German concatenations such as "Luftschiffahrtsmuseum" (airship transport museum)).