Only six of over 17,000 payloads launched into space are currently escaping the gravitational pull of the Sun, a testament to the immense power of the star at the center of our solar system. As of March 2, 2026, Voyager 1 remains the farthest and fastest human-made object from Earth, a distinction it achieved on February 17, 1998, when it surpassed Pioneer 10.
The first spacecraft to achieve escape velocity was Pioneer 10, launched in 1972. Its trajectory was significantly altered by a December 1973 encounter with Jupiter, providing a gravitational boost that propelled it outward. Pioneer 11, launched the same year, followed a similar path, utilizing Jupiter’s gravity not only for escape velocity but also to reach Saturn, where it narrowly missed Saturn’s moon Epimetheus by approximately 4,000 kilometers.
Voyager 2 and Voyager 1, launched just sixteen days apart in 1977, represent the pinnacle of this outward journey. Voyager 1, after flybys of Jupiter and Saturn, became the fastest spacecraft ever launched, overtaking Pioneer 10 in 1998. Voyager 2, taking a more circuitous route with flybys of all four gas giants, entered interstellar space in 2018, surpassing Pioneer 10’s distance in 2023. Both Voyager probes have provided invaluable data on the interstellar medium, the region between stars filled with debris from long-dead stars.
Whereas these missions represent significant achievements, the Sun’s gravitational dominance remains paramount. A spacecraft must achieve speeds nearly four times greater at the Earth-Sun distance than from Earth’s gravity to escape the solar system entirely. This November, Voyager 1 will reach a distance of 1 light-day from Earth, a milestone in spaceflight.
The Ulysses spacecraft, launched in 1990 to study the Sun at various latitudes, is also destined to abandon the solar system, but not until 2098, due to its unique orbit and gravitational interactions with Jupiter and Mars. Latest Horizons, launched in 2006, received boosts from Jupiter and Pluto but will not overtake the Voyagers in terms of speed.
Advancements in propulsion technology, such as laser-driven spacecraft, may be required to surpass Voyager 1’s speed and distance in the future, but significant technological hurdles remain. Currently, no other mission launched to date is projected to overtake Voyager 1, which continues its journey outward, carrying a head start of nearly five decades.
