A 1970s metal emissary has become humanity's first interstellar traveler

Space · Published 26 October 2026 Swipe more like this →

In short: Launched over four decades ago, Voyager 1 is now more than 25 billion kilometers from Earth. It has officially left our solar system’s protective bubble to explore the silent void of interstellar space—a monumental achievement that turned a planetary study into a journey toward the stars.

Voyager 1 launched on September 5, 1977, during a rare celestial event known as "The Grand Tour." This alignment occurs only once every 176 years, positioning Jupiter, Saturn, Uranus, and Neptune in a way that allowed a single spacecraft to use their gravity as slingshots. While it was originally designed to study the properties of these giant planets, its trajectory eventually propelled it beyond our solar system's boundaries.

The probe reached a major milestone in August 2012 when it crossed the heliopause—the boundary where the Sun's influence ends and the interstellar medium begins. This region is filled with gas, plasma, and particles originating from other stars and regions outside our own system. Today, Voyager 1 remains the most distant human-made object, having overtaken Pioneer 10 in February 1998 to claim its title.

To keep the mission alive nearly 50 years into its journey, engineers at NASA's Jet Propulsion Laboratory (JPL) have had to make difficult choices. On April 17, they shut down specific instruments to conserve power from the spacecraft's three Multi-Hundred Watt Radioisotope Thermoelectric Generators. Despite these limitations, the probe continues to transmit unique data on the nature of interstellar space, providing our first direct look into the cosmic neighborhood beyond our star.

During its early years, Voyager 1 provided groundbreaking discoveries, such as identifying a thin ring around Jupiter and finding five new moons at Saturn, including the G-ring. Now, it serves as a primary tool for understanding how solar events propagate from the Sun to the edge of our heliosphere, transforming from a planetary scout into an interstellar pioneer.

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