The target was the process ESA (the European Space Agency) developed to make oxygen out of moonrocka.

According to CNN:

Talk about a hard target. This was extremely exhausting to do and I had absolute zero clue what was going on, but upon feedback it makes sense now. Due to the nature of the target, I am satisfied with the things I got right.

My first visual impression was a sandy, wavy, porouse, bumpy, dunes-like land behind and very dark, almost black crackly, edgy, grooved, natural rocky formations which I called black rocks and weird cracky lava rocks. The manmade marked with 2 on the drawing was described as membrane-like, stretched out, strung out, soaked, rectangular, textily. The manmade marked with 1 on the drawing was described as metallic, tubular, pipette-like and branching out.

The above view of the target rendered the following data:

So the matches I found to the target are:

  1. The main ingredient to be used for oxygen production is lunar regolith, a type of moon rock that contains up to 40-45% oxygen. Lunar regolith is a shardy rocky substance, with a darker grey colour slightly lighter then coffee powder.
Paul O. Hayne | Lunar Regolith

2. The main ingredient is used in a powdered for for the metalysis procedure. The biproduct is also expected to be a metallic powder.

Oxygen and metal from lunar regolith pillars

3. Metalysis does require an anode pair for the rock (acting as the cathode) in a wet, submerged electrolytic environment. But to our current knowledge no membrane-like material strung-out is necessery for the metalysis process. so I will have to check later if ever a filter or membrane gets added to the procedure.

British firm given £250,000 to figure out how to extract oxygen from moon  rocks | Daily Mail Online

4. Precious secondary raw materials (metals) are precipitated after the metalysis process is finished.

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