Shown in a Hubble Space Telescope image, the "astrosphere" around the star L.L. Orionis approximates the heliosphere around our solar system. Image courtesy ESA/NASAFrom The National Geographic:
NASA craft reveals unexpected unpredictability of our protective bubble.
It's cold, dusty, and bereft of planets, but the outskirts of our solar system are anything but dull, according to increasing evidence from NASA's Interstellar Boundary Explorer (IBEX) craft.
As charged particles flow out from the sun, they eventually bump up against interstellar medium—the relatively empty areas between stars. These interactions "inflate" a protective bubble that shields Earth and the entire solar system from potentially harmful cosmic rays (solar system pictures).
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