It took Voyager 2 about a day to pass through the heliopause, and experts discovered that the plasma barrier is hotter and thicker than they previously believed.
Edward Stone, co-author of the study, sayd the shield stops about 70% of cosmic radiation.
“The heliopause is the contact surface where two winds [collide] — the wind from the sun and the wind from space, which comes from supernova that exploded millions of years ago. Only about 30% of what’s outside of the bubble can get in,” Stone said.
Even more, the researchers found that the boundaries of the heliopause are not as uniform as anticipated. It contains porous holes through which interstellar radiation can leak.
On our side of the heliopause, V2 detected two such holes, where radiation levels are higher than normal.
The solar wind might not completely protect our solar system but, according to the discoveries made by Voyager 2, it manages to separate our solar system from the ferocious cosmic rays coming from interstellar sppace.