All the "mysterious" events happening in our solar system, like the sun's odd behaviour for the past few years, ie, the extremely low activity, the heliosphere shrinking, cosmic rays rising, climate changing on Earth, it all points to one of these clouds entering the solar system. Or the solar system entering a cloud, depends on how you look at it and on the size of this cloud. If the cloud is dense it will push back the heliopshere to within 1 AU and leave the Earth unprotected and depending on the characteristics of the clouds, ie density, temperature, composition etc, there are various effects.


Eons ago, giant clouds in space may have led to global extinctions, according to two recent technical papers supported by NASA’s Astrobiology Institute.