Cyclical Nova perhaps. Our own sun Novas cyclically. Some stars are on a 20million year cycle, some on a 10 year cycle. Our sun appears to be on a 12,000year cycle, the last great cataclysm being 10000BC, or 12,000years ago.
They don't want you to know what they found on the moon. Melt glass that could have only formed in the expanding shell of a Nova eruption.