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Voyager 1 has already traveled more than 25 billion kilometers, becoming the human-made object farthest from Earth and continues sending scientific data even after almost 50 years of mission.
When Voyager 1 left Earth on September 5, 1977, its mission seemed relatively simple: visit Jupiter and Saturn, capture unprecedented images of the gas giants, and end its journey a few years later. However, almost five decades later, the probe continues traveling through deep space and is about to reach a milestone that no other human-created object has achieved: being 1 light-day away from Earth. The curiosity was highlighted by the ScienceAlert portal in a report published on July 10, 2026, based on official NASA data.
Today, Voyager 1 is already more than 25 billion kilometers from Earth and continues transmitting scientific information to researchers. Even traveling at approximately 61 thousand kilometers per hour, it is only expected to reach the distance equivalent to one light-day in November 2026, demonstrating how immense the Universe is when compared to the speed of light.
A mission that was supposed to last a few years
Voyager 1 was developed by NASA during the 1970s to take advantage of a rare alignment of the giant planets in the Solar System. Thanks to this configuration, it would be possible to visit several planets using the gravity of each to gain speed, drastically reducing the fuel required for the mission.
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After launch, the probe made historic flybys of Jupiter in 1979 and Saturn in 1980, capturing images and scientific data that revolutionized knowledge about these worlds. Its success was so great that NASA decided to keep the mission active, allowing Voyager to continue heading towards interstellar space.
The probe has already left the direct influence of the Sun
In 2012, Voyager 1 achieved another historic feat. It crossed the heliopause, the boundary where the predominant influence of the solar wind ends and interstellar space begins. Although it still remains under the Sun’s gravity, the probe left the enormous bubble of charged particles produced by our star, becoming the first human-made object to directly explore the environment between the stars.
Since then, its instruments have been measuring particles, magnetic fields, and radiation in a region that had never been studied by a spacecraft.
What does it mean to be one light-day from Earth?
Despite having traveled more than 25 billion kilometers, Voyager 1 has not yet completed even one light-day of distance. This unit represents the distance that light travels in 24 hours. Since light travels at approximately 300 thousand kilometers per second, it is extremely faster than any spacecraft ever built.
In practice, this means that a signal sent from Earth still takes less than a day to reach Voyager 1. According to calculations presented by NASA, the probe is expected to officially surpass this mark in November 2026. Although it seems like a technical detail, it is an impressive symbolic milestone, as no human-made object has ever been so far away.
An impressive speed that still seems small compared to the Universe
Voyager 1 travels at about 17 kilometers per second, equivalent to approximately 61 thousand kilometers per hour. This speed would be enough to complete more than one full circle around the Earth in less than an hour. Even so, when compared to interstellar distances, it seems incredibly small.
The closest star to the Solar System, Proxima Centauri, is located about 4.24 light-years from Earth. Maintaining its current speed, Voyager would take tens of thousands of years to cover that distance. This comparison helps to show how space is much larger than we normally imagine and why even the most successful space missions represent only the first steps of interstellar exploration.
Still sends data almost 50 years later
The fact that Voyager 1 continues to function is considered one of the greatest feats of space engineering. The probe’s power is supplied by thermoelectric generators powered by plutonium, whose power slowly decreases over the years. To prolong the mission, NASA has turned off some scientific instruments and systems considered less essential, preserving those that can still provide unique data about interstellar space. Even with increasing limitations, Voyager continues to send information that helps scientists better understand the region located beyond the Sun’s direct influence.
Almost half a century after leaving Earth, the mission that was born to explore just two planets has become one of the greatest demonstrations of human capability to build machines capable of surviving and operating in an extremely hostile environment. Soon, upon officially reaching the mark of 1 light-day away, Voyager 1 will add another historic chapter to space exploration, consolidating its position as the most distant human-made object ever existing.
