Researchers have measured neutral “alien” particles that have entered our solar system from interstellar space.
The team used NASA’s Interstellar Boundary Explorer (IBEX) spacecraft to find the neutral particles, which make up about half the material outside the heliosphere. The heliosphere is the bubble in which our Sun and planets reside and is formed by the interaction between the solar wind and the interstellar medium.
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http://www.redorbit.com/news/space/1112465592/new-alien-particles-have-entered-our-solar-system/
