They’re as busy as ever over at NASA. As if the SLS wasn’t enough, it has also been announced that the US space agency plans to launch two spacecraft on a nine-month mission to map the moon’s gravity field. The aim of all this is to improve our knowledge of the moon’s interior and its evolution. Naturally, such an expedition deserves a snappy acronym, so the two spacecraft are collectively known as the Gravity Recovery And Interior Laboratory – or GRAIL – satellites. God speed, heavenly bodies.
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