Voyager 2 spacecraft studies the outer limits of the heliosphere. - stock illustration

This artist's rendering depicts NASA's Voyager 2 spacecraft as it studies the outer limits of the heliosphere, a magnetic bubble around the solar system that is created by the solar wind. Scientists observed the magnetic bubble is not spherical, but pressed inward in the southern hemisphere. These findings help build up a picture of how the sun interacts with the surrounding interstellar medium.