The solar wind and the sun's magnetic field act as a protective bubble around the solar system and shield it from cosmic rays.
Astronomy

The Sun’s ‘Sphere of Influence’ May Be Shaped Like a Bubble, Not a Comet

The solar wind and the sun's magnetic field act as a protective bubble around the solar system and shield it from cosmic rays.

Published On 04/26/2017
9:57 PM EDT
NASA/JPL
New data from NASA’s Cassini, Voyager and Interstellar Boundary Explorer missions show that the heliosphere — the bubble of the sun’s magnetic influence that surrounds the inner solar system — may be much more compact and rounded than previously thought. The image on the left shows a compact model of the heliosphere, supported by this latest data, while the image on the right shows an alternate model with an extended tail. The main difference is the new model’s lack of a trailing, comet-like tail on one side of the heliosphere. This tail is shown in the old model in light blue. | Dialynas, et al. (left); NASA (right)