This photo shows the Lucy spacecraft aboard at Space Launch Complex 41 at Cape Canaveral Space Force Station. AP

A NASA spacecraft named Lucy rocketed into the sky with diamonds Saturday morning on a 12-year quest to explore eight asteroids.

Seven of the mysterious space rocks are among swarms of asteroids sharing Jupiter's orbit, thought to be the pristine leftovers of planetary formation.

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An Atlas V rocket blasted off before dawn, sending Lucy on a roundabout orbital journey spanning nearly 4 billion miles (6.3 billion kilometers). Researchers grew emotional describing the launch - lead scientist Hal Levison said it was like witnessing the birth of a child. "Go Lucy!” he urged.

Lucy is named after the 3.2 million-year-old skeletal remains of a human ancestor found in Ethiopia nearly a half-century ago. That discovery got its name from the 1967 Beatles song "Lucy in the Sky with Diamonds,” prompting NASA to send the spacecraft soaring with band members' lyrics and other luminaries’ words of wisdom imprinted on a plaque. The spacecraft also carried a disc made of lab-grown diamonds for one of its science instruments.

A display shows NASA's Lucy spacecraft for a mission to study the Trojan asteroids in Cape Canaveral. Reuters

Named after an ancient fossil of a pre-human ancestor, Lucy will become the first solar-powered spacecraft to venture so far from the Sun, and will observe more asteroids than any probe before it -- eight in all.

Scientists hope Lucy's close-up fly-by of seven Trojans will yield new clues to how the solar system's planets came to be formed some 4.5 billion years ago and what shaped their present configuration.

Believed to be rich in carbon compounds, the asteroids may even provide new insights into the origin of organic materials and life on Earth, NASA said.

Additionally, Lucy will make three Earth flybys for gravity assists, making it the first spacecraft to return to our planet's vicinity from the outer solar system.

Photographers set cameras for NASA's Lucy spacecraft at Cape Canaveral Space Force Station in Florida. Reuters

"Each one of those asteroids, each one of those pristine samples, provide a part of the story of the solar system, the story of us," Thomas Zurbuchen, associate administrator of NASA's Science Mission, told reporters on a call.

Lucy's first encounter will be in 2025 with asteroid Donaldjohanson in the Main Belt, between Mars and Jupiter. The body is named for the discoverer of the Lucy fossil.

The probe will use rocket thrusters to maneuver in space and two rounded solar arrays, each the width of a school bus, to recharge batteries that will power the instruments contained in the much smaller central body of the spacecraft.