The idea that the heavens might collapse is also attested to in the Irish traditions. Conceivably, the early Irish believed that the firmament was supported by a pillar which might one day collapse. A "Pillar of the Sun", Solis columna, at the source of the Rhone is mentioned by the Roman poet Avienus.

Resource

Maier, Bernhard. Edwards, Cyril, trans. Dictionary of Celtic Religion. (Richester, NY: The Boydell Press, 1997.) Page 110.