Banded iron rocks, formed before oxygen saturated the atmosphere but after photosynthetic bacteria started releasing …

Banded iron rocks, formed before oxygen saturated the atmosphere but after photosynthetic bacteria started releasing oxygen into the ocean, alternate layers of different iron-containing minerals that may reflect changes in bacterial population.

#geology #prehistory

https://www.atlasobscura.com/places/banded-iron-formation-stone

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A binary star system passed within one light year of our solar system only 70,000 years ago. It may have jostled a bunch of comets out of their orbits at the time.

A binary star system passed within one light year of our solar system only 70,000 years ago. It may have jostled a bunch of comets out of their orbits at the time.

Did a close pass by an alien star system millennia ago rain down comets on the solar system?