Launched in 1977, Voyager 2 continues its journey through interstellar space, carrying a golden record of Earth’s sounds and images. As humanity’s most enduring ambassador, the probe is now over 12 billion miles from the Sun, traveling in the direction of the constellation Telescopium. Understanding where is Voyager 2 going requires looking at both its current trajectory and the science driving its extended mission.
Exit from the Heliosphere
In 2018, Voyager 2 crossed the heliopause, the boundary where the solar wind yields to the interstellar medium. This transition provided the first direct measurements of the density and temperature of material between stars. Unlike its twin, Voyager 1, which exited through a different region, Voyager 2 offered a complementary data set. The probe confirmed that the heliosphere is not a perfect bubble and that its shape is influenced by external pressures.
The Current Trajectory and Velocity
As it moves away from the inner Solar System, Voyager 2 is following an escape trajectory. Its velocity relative to the Sun is about 15.342 kilometers per second, gradually slowing due to gravitational deceleration. The spacecraft is on a path that will keep it on course for thousands of years unless an external force alters it. This trajectory places it on a course that will bring it near a star in roughly 42,000 years.
Next Stellar Approaches
While Voyager 2 will not reach any specific star for hundreds of thousands of years, its trajectory is calculated to bring it relatively close to several stars in the future. In approximately 42,000 years, it will pass within 1.7 light-years of the star Ross 248. This red dwarf, located in the constellation Andromeda, is currently the closest star to the Sun that the probe will encounter. The passage will provide a rare opportunity to study interstellar navigation on a human timescale.
Power and Communication Constraints The radioisotope thermoelectric generators (RTGs) on Voyager 2 are decaying, and power output is diminishing by about 4 watts per year. To manage this, mission controllers have systematically turned off scientific instruments and heaters. They prioritize the radio transmitter, which sends data back to Earth through the Deep Space Network. Current estimates suggest that science operations will cease between 2025 and 2030, though the spacecraft will continue to travel silently. Scientific Objectives in Deep Space
The radioisotope thermoelectric generators (RTGs) on Voyager 2 are decaying, and power output is diminishing by about 4 watts per year. To manage this, mission controllers have systematically turned off scientific instruments and heaters. They prioritize the radio transmitter, which sends data back to Earth through the Deep Space Network. Current estimates suggest that science operations will cease between 2025 and 2030, though the spacecraft will continue to travel silently.
Even as it leaves the Solar System, Voyager 2 provides valuable data on the interstellar environment. It measures cosmic rays, magnetic fields, and the density of hydrogen in the Milky Way. This information helps scientists model the interaction between the heliosphere and the galaxy. The probe essentially acts as a mobile laboratory, sampling regions of space that no spacecraft has visited before.
Cultural and Philosophical Implications
Where is Voyager 2 going is also a question of human legacy. The Golden Record contains greetings, music, and images intended for any intelligent life that might find it. The probe serves as a time capsule of human civilization in the early 1970s. Its journey challenges our understanding of permanence and the scale of our existence within the universe.
