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 may have shaped our evolution, a study suggests 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 may have shaped our evolution, a study suggests  New Scientist – News