NASA launched Voyager 2 42 years ago on August 20, 1977, to explore the farthest planets of the solar system. Since its launch, the probe has encountered several planets, including Jupiter, Saturn, Uranus and Neptune. One year ago, on November 5, 2018, the probe entered the interstellar space.
Is Voyager 2 still broadcasting?
Voyager 2 left the heliosphere, a huge balloon created and maintained by the Sun in November last year.  When she came out, she had spent about 41 years in space, transmitting data back to NASA for the outer reaches of the solar system.
The probe has now entered the interstellar space and continues to transmit back to its NASA processors. [1
9659006] Several studies of Voyager 2 data have revealed what it discovered after analyzing data from its intersection more than a year ago.
New reports published in Nature Astronomy have revealed that Voyager 2 has detected "unexpected" differences in plasma density, gas made of ions and free electrons.
According to studies, plasma in the local interstellar space is denser than plasma in the heliosphere.
Voyager 2 also finds that plasma in the interstellar space is much colder.
Ed Sto No, who has worked as a scientist for the Voyager project since 1975, stated that voyager temperature changes provide NASA with qualitative data on the size of the heliosphere.
He said, "Our voyage has expanded deeper and deeper into space.
"We had no quantitative idea how big this balloon was that the sun was creating around it with its supersonic solar wind made of ionized plasma, which is accelerated by the sun in all directions.
" And we did not know the spacecraft could live long enough to reach the edge of the bubble, leave it, and enter the nearby interstellar space. “
However, Voyager 1 and Voyager 2 provide different data.
When the first probe made the trip to the interstellar space, scientists believe that it had penetrated the heliosphere in a less perpendicular trajectory.
Bill Kurt, a co-author of the study and University of Iowa Scientist, suggested that this means that the heliosphere is symmetric.
He said, "It says that these two points on the surface are almost at the same distance."