Voyager 2 e a heliosfera

https://www.theguardian.com/science/2019/nov/04/nasa-voyager-2-sends-back-first-signal-from-interstellar-space

Citando:
"The second set of measurements, by Voyager 2, give new insights into the nature of the heliosphere’s limits because on Voyager 1 a crucial instrument designed to directly measure the properties of plasma had broken in 1980.

Measurements published in five separate papers in Nature Astronomy reveal that Voyager 2 encountered a much sharper, thinner heliosphere boundary than Voyager 1. This could be due to Voyager 1 crossing during a solar maximum (activity is currently at a low) or the craft itself might have crossed through on a less perpendicular trajectory that meant it ended up spending longer at the edge."