Fossils from the formation of the solar system
In the early hours of an October morning, humanity extended its gaze further into its own origins — launching a spacecraft named after one of our oldest known ancestors toward some of the oldest known remnants of the solar system. The Lucy mission, a twelve-year, four-billion-mile journey to Jupiter's Trojan asteroids, is less an act of exploration than an act of remembrance: a civilization reaching back through time to understand the raw materials from which it emerged. At nearly a billion dollars and spanning generations of scientific patience, Lucy asks the oldest of questions — where did all of this come from — with the newest of tools.
- A pre-dawn rocket launch from Cape Canaveral marked the beginning of one of NASA's most ambitious and labyrinthine deep-space itineraries ever attempted.
- The mission's twelve-year timeline and counterintuitive flight path — requiring multiple Earth gravity assists and a mid-course asteroid detour — initially struck even NASA's own science chief as too improbable to be real.
- Lucy must navigate not just vast distances but scientific uncertainty, approaching eight never-before-visited asteroids that could look like almost anything — mountains, mesas, craters, or something no one has imagined.
- The spacecraft carries symbolic weight alongside its instruments: diamonds, Beatles lyrics, and the presence of the paleoanthropologist who discovered the fossil that gave Lucy its name, binding deep human history to deep cosmic time.
- The mission lands within a broader NASA moment — as Lucy reaches backward toward solar system formation, a parallel mission is being readied to deflect asteroids forward, protecting the future humanity is still writing.
Before dawn on a Saturday in October, an Atlas V rocket rose from Cape Canaveral carrying a spacecraft named Lucy — and with it, a question humanity has long carried: where did the solar system come from?
The mission's name is deliberate and layered. Lucy is named after a 3.2-million-year-old human ancestor fossil discovered in Ethiopia, which was itself named after the Beatles song "Lucy in the Sky with Diamonds." NASA honored that chain of discovery by etching band members' lyrics and words from other luminaries onto a plaque aboard the craft, alongside a disc of lab-grown diamonds used in one of its science instruments. Donald Johanson, the paleoanthropologist who found the original fossil decades ago, stood at Cape Canaveral to watch the launch — moved, he said, by the collision of deep human time and deep cosmic time.
The $981 million mission is bound for Jupiter's Trojan asteroids — vast swarms of rocky bodies sharing the gas giant's orbital path, thought to be pristine leftovers from the solar system's formation billions of years ago. Lucy will visit eight of them in total, using Earth's gravity as a slingshot on multiple occasions to build enough speed for the journey. It will pass an asteroid named Donaldjohanson in 2025 as an instrument test, reach five leading Trojans in the late 2020s, and — after another gravity assist in 2030 — encounter two trailing Trojans in 2033.
The route was so elaborate that NASA's own science mission chief, Thomas Zurbuchen, initially couldn't believe it was possible. Lucy will pass within 600 miles of each target, its cameras poised to reveal surfaces no human instrument has ever seen. "Are there mountains? Valleys? Pits? Mesas? Who knows?" said Johns Hopkins scientist Hal Weaver. "I'm sure we're going to be surprised."
The mission unfolds alongside a parallel NASA effort: a separate spacecraft set to launch the following month to test whether humanity could redirect an asteroid on a collision course with Earth. Together, the two missions frame asteroids as both archive and adversary — one holding the memory of our origins, the other posing a question about our survival.
Before dawn on a Saturday in October, an Atlas V rocket lifted off from Cape Canaveral carrying a spacecraft named Lucy on a journey that would take twelve years and nearly four billion miles. The mission's destination: eight asteroids, seven of them part of vast swarms that orbit Jupiter in the same path as the gas giant itself, thought to be pristine remnants left over from the formation of the solar system billions of years ago.
The spacecraft's name carries weight. Lucy is named after skeletal remains discovered in Ethiopia nearly fifty years earlier—a human ancestor who lived 3.2 million years ago. That fossil discovery itself was named after a Beatles song, "Lucy in the Sky with Diamonds," a connection NASA decided to honor by sending the spacecraft aloft with band members' lyrics and words from other luminaries etched onto a plaque. The spacecraft also carried something more unusual: a disc made of lab-grown diamonds, part of one of its science instruments. Donald Johanson, the paleoanthropologist who discovered the original Lucy fossil, traveled to Cape Canaveral to watch the launch. He spoke of wonder at this collision of deep time—a human ancestor from millions of years ago inspiring a mission designed to unlock secrets of how the solar system itself came to be.
The Lucy mission costs $981 million and represents the first time NASA has aimed directly at Jupiter's so-called Trojan asteroids. These are thousands, possibly millions, of rocky bodies that share Jupiter's orbit around the sun, some leading the planet and others trailing behind it. Despite sharing the same orbital path, the Trojans are scattered far apart and remain distant from Jupiter itself, meaning Lucy faces essentially no danger of collision as it passes its targets. The mission's principal scientist, Hal Levison of Southwest Research Institute, confirmed this reassuring fact.
The path Lucy will take is anything but direct. The spacecraft will use Earth's gravity as a slingshot, swooping past the planet next October and again in 2024 to gain enough speed to reach Jupiter's orbit. On the way, it will pass an asteroid named Donaldjohanson—positioned between Mars and Jupiter—in 2025, serving as a test run for the spacecraft's instruments. Powered by two enormous circular solar wings, Lucy will then chase down five asteroids in the leading Trojan cluster in the late 2020s. After that, it will swing back toward Earth in 2030 for another gravity assist, which will redirect it toward the trailing cluster of Trojans, where it will encounter the final two targets in 2033.
The route is so intricate and counterintuitive that Thomas Zurbuchen, NASA's science mission chief, initially doubted it was feasible. "You've got to be kidding. This is possible?" he recalled asking when the plan was first presented to him. Lucy will pass within 600 miles of each asteroid it encounters. The largest target is roughly 70 miles across. Hal Weaver, a scientist at Johns Hopkins University who oversees Lucy's black-and-white camera, expressed genuine anticipation about what the mission might reveal. "Are there mountains? Valleys? Pits? Mesas? Who knows?" he said. "I'm sure we're going to be surprised. But we can hardly wait to see what images will reveal about these fossils from the formation of the solar system."
The Lucy mission arrives as NASA is simultaneously preparing another effort: next month, the agency plans to launch a separate mission designed to test whether humans could alter an asteroid's trajectory if a dangerous rock were ever headed toward Earth. The two efforts together represent a dual approach to asteroids—one focused on understanding the deep past, the other on protecting the future.
Citações Notáveis
A human ancestor who lived so long ago stimulated a mission which promises to add valuable information about the formation of our solar system is incredibly exciting.— Donald Johanson, paleoanthropologist, Arizona State University
Are there mountains? Valleys? Pits? Mesas? Who knows? I'm sure we're going to be surprised.— Hal Weaver, Johns Hopkins University, Lucy camera lead
A Conversa do Hearth Outra perspectiva sobre a história
Why name a spacecraft after a fossil? Why not just call it something technical?
Because the fossil Lucy represents a moment when humans realized we had a deep past—that we came from somewhere. NASA wanted to honor that same impulse to look backward and understand origins. The spacecraft is doing the same thing, but for the solar system.
The route sounds absurdly complicated. Why not just go straight to Jupiter?
There isn't a straight path. Lucy needs Earth's gravity to slingshot it outward twice. It's like borrowing momentum from home to reach somewhere impossibly far away. The detours are actually the most efficient way.
What makes these Trojan asteroids so important?
They're thought to be unchanged since the solar system formed. They're time capsules. By studying them, we learn what the raw materials of planetary formation actually looked like.
Diamonds on a spacecraft seems symbolic. What's the practical reason?
One of the instruments needs a diamond disc. But yes, it's also symbolic—another layer of meaning layered onto the mission.
Is there any real danger to the spacecraft?
Not from the asteroids themselves. They're so spread out that collision is essentially impossible. The real risks are the same ones any deep-space mission faces: equipment failure, radiation, the sheer distance from home.