Cosmic cloud exposed Earth to interstellar space 3 million years ago
The protective bubble around the sun retreated dramatically after colliding with a freezing interstellar cloud, leaving much of the solar system exposed to radiation that shaped our evolution, a study suggests
![Cosmic cloud exposed Earth to interstellar space 3 million years ago](https://images.newscientist.com/wp-content/uploads/2024/06/10114946/SEI_2081311911.jpg)
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