Summary:
- NASA's Voyager 1 spacecraft, launched in 1977, has reached a new milestone by detecting a faint, constant hum outside our solar system, providing insights into the nature of interstellar space.
- The hum, which is a low-level vibration, is believed to be caused by plasma, or ionized gas, present in the vast region between stars, known as the interstellar medium.
- This discovery helps scientists better understand the environment beyond the heliosphere, the bubble of charged particles from the Sun that surrounds the solar system, and provides valuable information about the transition between our solar system and interstellar space.