How the Procellarum KREEP Terrane (PKT) formed is arguably the most significant open question in lunar science. Relating to this. a study has found the answers to the mystery of the dark side of the moon which had been an Apollo-era mystery.
The face of the Moon which is always observable from Earth is noticeably distinct from its other side, known as the "dark side of the Moon" The latter is noticeably more cratered, and so this astounding difference has long perplexed scientists.
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