Voyager 2: leaving the Solar System

In recent months the satellite Voyager 2, launched in 1977, became the second man-made object to escape from our Solar System and begin its journey into interstellar space. We know it’s done that because it’s crossed the heliopause, a bubble made by particles, called a plasma, that stream off the Sun and surround our Solar system. To learn more about this Adam Murphy spoke to Du Toit Strauss from North West University in South Africa...