If these things “posed a threat” they would have acted long ago. It is curious, but folks with their hair on fire haven’t been paying attention. These little balls have been flying around since the Middle Ages. At least.
See post #40 above.
They are mentioned in the Hindu Vedas. Many thousands years ago. Lots of interesting stuff in those. Funny that such ancient goat herders could know about Earth’s 26000 year precession cycle.