Voyager 1

Voyager 1 completed 10 Years in interstellar medium. The past ten years have been devoted to human exploration of the galaxy. NASA's Voyager 1 probe passed the threshold between the influence of the solar and the interstellar medium on August 25, 2012, when it was 11 billion miles (18 billion kilometres) from the sun. Voyager 1 and Voyager 2, which joined it in interstellar space in 2018, are still operating and sending back data today, continuing to carry out groundbreaking research. 

Voyager 1 and Voyager 2 were launched in 1977 with the primary purpose of exploring Jupiter and Saturn. Voyager 1 prioritised Saturn's enormous moon Titan, sending it on a new track to the edge of the solar system, whereas Voyager 2 prioritised Uranus and Neptune. When Voyager 1 reached 122 astronomical units (AU) from the sun, it became the first man-made object to explore interstellar space, which is the area between stars in a galaxy. (One AU, or around 93 million miles or 150 million kilometres, is the standard distance between Earth and the sun.) 

Because of particle density, scientists are certain that the Voyager probes have left the heliosphere, where the solar wind, a stream of charged particles from the sun, prevails, and entered interstellar space. Scientists can now determine the true nature of the interstellar medium thanks to Voyager 1's position 40 AU beyond the heliopause. It turns out that the heliosphere has a far greater impact than originally anticipated. The interstellar medium is disturbed and impacted by the sun, according to measurements made by the Voyager probes, according to scientists. We still don't fully comprehend what is happening because it is so different from what we had anticipated. The "silent ambassadors" will eventually stop communicating once they enter what is known as the pure interstellar medium, according to scientists.