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Japanese scientists get first peek inside Hayabusa2 asteroid sample-return capsule

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Japanese scientists have gotten their first look inside the sample capsule of the Hayabusa2 spacecraft, and even the first glance is promising.

The Hayabusa2 spacecraft launched in 2014, bound for a near-Earth asteroid called Ryugu. The mission arrived at Ryugu in 2018 and spent about a year and a half observing and sampling the asteroid before leaving last year to deposit its sample capsule in Earth's atmosphere. On Dec. 5, that capsule landed in the Woomera Prohibited Area in Australia; scientists with the Japan Aerospace Exploration Agency (JAXA), which runs the mission, then flew the capsule to Japan.

On Monday (Dec. 14), mission personnel got their first look inside the capsule. "We confirmed black grains thought to be from Ryugu were inside," mission representatives wrote on Twitter. "This is outside the main chambers, and likely particles attached to the sample catcher entrance." 

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Scientists later opened one of the three sample chambers and confirmed that it contained a fair amount of asteroid dust. Those chambers hold the real treasures: they are where the Hayabusa2 spacecraft directed the pieces of Ryugu it snagged during two collection maneuvers.

During one of those sampling attempts, the spacecraft grabbed rocks from the asteroid's surface; during the second, it shot a copper bullet into the asteroid to uncover subsurface material. The combination should allow scientists to understand how the harsh environment of space has affected the surface of Ryugu.

Another early procedure conducted on the newly-returned capsule was to measure gases trapped inside it in case some of that gas originates from Ryugu itself.

JAXA personnel inspect Hayabusa2's return capsule against the red soil of the Woomera Prohibited Area in Australia on Dec. 5. (Image credit: JAXA)

JAXA has not yet announced when scientists will begin analyzing the asteroid bits in earnest. Despite Earth's sophisticated fleet of spacecraft, analyzing bits of other worlds in terrestrial labs still gives scientists much more powerful ways to address planetary science questions.

Because asteroids are primordial rubble left over from when the solar system formed, scientists hope that studying these samples of Ryugu will help them understand the early days of the solar system.

Email Meghan Bartels at mbartels@space.com or follow her on Twitter @meghanbartels. Follow us on Twitter @Spacedotcom and on Facebook.

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