The fridge-sized probe some 300 million kilometers from Earth where it explored the asteroid Ryugu.
TOKYO (AFP) — Japan’s Hayabusa-2 probe will leave orbit around a distant asteroid and head for Earth on Wednesday after an unprecedented mission, carrying samples that could shed light on the origins of the Solar System.
Science and Education Minister Koichi Hagiuda told reporters on Tuesday that the long voyage home would begin soon, with the probe expected to drop off its precious samples some time in late 2020.
The mission took the fridge-sized probe some 300 million kilometers (186 million miles) from Earth, where it explored the asteroid Ryugu, whose name means “Dragon Palace” in Japanese — a reference to a castle at the bottom of the ocean in an ancient fable.
In April, Hayabusa-2 fired an “impactor” into the asteroid to stir up materials that had not previously been exposed to the atmosphere.
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It then made a “perfect” touchdown on the surface of the asteroid to collect the samples that scientists hope will provide clues into what the Solar System was like at its birth some 4.6 billion years ago.
The six-year mission has a price tag of around 30 billion yen ($278 million).
It took the probe three-and-a-half years to get to the asteroid but the return journey should be significantly shorter because Earth and Ryugu will be much closer due to their current positions.
Hayabusa-2 is expected to drop the samples off in the South Australian desert, according to officials from the Japan Aerospace Exploration Agency (JAXA) and the Australian Space Agency (ASA).
The probe is the successor to JAXA’s first asteroid explorer “Hayabusa,” which means falcon in Japanese.
