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ScienceAsia

Hayabusa2: Japanese probe returns asteroid sample to Earth

December 5, 2020

The capsule from the Japanese space probe has landed in the Australian desert. Scientists are hoping for a treasure trove of information about the solar system and life on Earth from tiny samples of the asteroid Ryugu.

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The Japanese Hayabusa2 probe and Earth in an illustration
The 40-centimeter diameter capsule landed in the sparsely populated Woomera area of AustraliaImage: Department of Defence/AP/picture alliance

A capsule carrying asteroid samples from a Japanese space probe landed in the South Australian desert on Saturday, the Japanese Aerospace Exploration Agency (JAXA) reported.

Scientists hope the samples — possibly weighing just 0.1 grams — from the Ryugu asteroid will provide clues to the origin of life and the formation of the solar system. It is believed that the 4.6 billion-year-old material has remained unchanged since the system around the Earth's sun formed.

Read more: Hayabusa2: Capsule with asteroid samples scheduled to return to Earth

The probe took more than a year to travel back from the asteroid, which was around 300 million kilometers away from Earth when Hayabusa2 carried out its debris collecting task.

A treasure trove of information

The Hayabusa2 — the size of a refrigerator — first left Earth in 2014 and traveled more than 5 billion kilometers.

Scientists are eager to find out if the samples contain any organic material which could go toward explaining the origins of life on Earth.

"We still don't know the origin of life on Earth and through this Hayabusa-2 mission, if we are able to study and understand these organic materials from Ryugu, it could be that these organic materials were the source of life on Earth," said Hayabusa-2 mission manager Makoto Yoshikawa.

What happens next?

The capsule was separated from the probe when it was 220,000 kilometers (136,700 miles) away from Earth and entered the atmosphere shortly before 2:30 a.m. on Sunday Japan time (1730 UST on Saturday).

It appeared as a fireball as it entered the atmosphere and released a parachute 10 kilometers above the ground. Beacon signals suggest the parachute did open, and that the samples landed safely, said JAXA official Akitaka Kishi.

Members of the Hayabusa2 project team celebrate the successful maneuver of the probe to begin its new journey.
Members of the Hayabusa2 project team celebrated the probe's successful descentImage: JAXA/AP/picture alliance

The 40-centimeter (16-inch) diameter capsule landed in the sparsely populated Woomera area of Australia. JAXA staff were standing by to begin the search for the beacon with a helicopter after receiving radio signals, and were hopeful that they would find the capsule in a day.

Read more: Japan's Mars moons mission leads to human spaceflight

The capsule will undergo a preliminary safety inspection before being brought home early next week. Half of the material will be shared between JAXA, NASA, and other international agencies, while the other half will be kept for future study to take advantage of breakthroughs in analytic technology.

After depositing its samples, the Hayabusa2 probe took a new course to begin another journey, expected to take 10 years one way, to the small asteroid called 1998KY26.

ab/rc (dpa, AFP, AP)