BEIJING: China’s Chang’e-6 lunar probe looks set to begin its historic journey back to Earth from the moon’s far side after collecting samples that scientists expect will help answer key questions about the early evolution of the solar system.
Chang’e-6, named after the mythical Chinese moon goddess, was launched on May 3 from the southern Chinese island province of Hainan.
The fully robotic probe landed on Sunday in a previously unexplored location in a gigantic impact crater called the South-Pole Aitken Basin, on the side of the moon that permanently faces away from Earth.
China’s previous Chang’e mission collected samples from the moon’s near side in December 2020, restarting global lunar material retrieval efforts after a gap of 44 years.
The uncrewed Luna 24 mission launched by the former Soviet Union in 1976 collected 170.1 grams (6 ounces) of samples from Mare Crisium, or “Sea of Crises,” on the near side of the moon.
Between 1969 and 1972, six Apollo missions, all crewed, collected 2,200 samples weighing a total of 382 kilograms, also from the side of the moon facing Earth.
James Carpenter, head of the European Space Agency’s lunar science office, said the samples collected by the Apollo missions from the moon’s near side suggested the South-Pole Aitken Basin on the far side was caused by an epoch of extremely heavy bombardment of the solar system, Earth and moon.
“This is a really core event in the history of the whole solar system, but there is some controversy about whether it happened or not,” he said.
“To understand that, you need to anchor those events, and that’s going to be done with samples from the lunar far side from the South-Pole Aitken Basin.”
SMALL WINDOW
After landing, Chang’e-6 had a 14-hour window to drill, excavate, and seal 2 kg of material, with the goal of being the first probe to bring back such samples from the moon’s far side. This compares to the 21-hour window Chang’e-5 had in 2020.
“Once it gets dark, once the sun goes over the horizon, the mission has to end, so there is a limited time window between landing, getting those samples, and getting off the surface again, so it’s quite an exciting mission because it has to be done quickly,” Carpenter said.
While China said it had improved the efficiency of its digging and drilling machines compared with 2020, the mission could still encounter snags at the sampling phase.
Chang’e-5 returned 1.73kg of lunar samples, rather than the planned 2kg, as the drill was only able to create a hole one meter deep, rather than two meters, after encountering impenetrable layers beneath the surface.
The Chang’e-6 samples will be transferred and sealed on a rocket booster atop the lander, which will launch back into space, dock with another spacecraft in lunar orbit and transfer the samples.
A landing in China’s Inner Mongolia is expected around June 25.
Throughout the probe’s journey, payloads from Italian, French, and Pakistani research institutes, as well as the European Space Agency, will collect data on questions pertaining to space and the moon, highlighting the growing international weight of China’s space program, which is competing with the United States to build a lunar outpost in the next decade.
Carpenter said there was “extremely strong” collaboration between European and Chinese scientists in analizing the lunar samples brought back by Chang’e-5, and he hoped this would be repeated for Chang’e-6.
China’s lunar probe could return with answer to origins of solar system
https://arab.news/69my8
China’s lunar probe could return with answer to origins of solar system
- Chang’e-6, named after the mythical Chinese moon goddess, was launched on May 3
- A landing in China’s Inner Mongolia is expected around June 25
IAEA board meets over Ukraine nuclear safety concerns
- The war in Ukraine “continues to pose the world’s biggest threat to nuclear safety,” Grossi said
- The mission will assess 10 substations “crucial to nuclear safety,” according to Grossi
VIENNA: The UN nuclear watchdog’s board of governors on Friday discussed nuclear safety in Ukraine, with several countries expressing “growing concern” following Russian attacks on the power grid.
Energy supplies to Ukraine’s nuclear plants have been affected as Russia has pounded its neighbor’s power sector since the start of its 2022 invasion, prompting fears of a nuclear disaster.
The war in Ukraine “continues to pose the world’s biggest threat to nuclear safety,” Rafael Grossi, director general of the International Atomic Energy Agency (IAEA), said when opening the board meeting.
The extraordinary meeting that lasted four hours was called after 13 countries led by the Netherlands expressed in a letter seen by AFP a “growing concern about the severity and urgency of nuclear safety risks” following a series of attacks.
Ukrainian ambassador Yurii Vitrenko told reporters before the meeting that it was “high time” for the IAEA board to discuss the situation.
A weeks-long IAEA expert mission to Ukrainian substations and power plants is under way and expected to wrap up next month, Vitrenko said.
The mission will assess 10 substations “crucial to nuclear safety,” according to Grossi.
Russian Ambassador Mikhail Ulyanov dismissed the board’s gathering as “absolutely politically motivated,” adding there was “no real need to hold such a meeting today.”
Last week, Ukraine’s Chernobyl nuclear power plant temporarily lost all off-site power.
Europe’s biggest nuclear power plant, Zaporizhzhia, occupied by Russian forces since March 2022, has also been repeatedly affected by fighting.
Earlier this month, Russia and Ukraine agreed to a localized ceasefire to allow repairs on the last remaining backup power line supplying Zaporizhzhia.
The line was damaged and disconnected as a result of military activity in early January.
The Zaporizhzhia plant’s six reactors have been shut down since the occupation. But the site still needs electricity to maintain its cooling and security systems.
Moscow and Kyiv have repeatedly accused each other of risking a nuclear catastrophe by attacking the site.
