Absolutely necessary

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Now we are looking on the crossword clue: Absolutely necessary.
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Possible Answers: INTEGRAL.

Random information on ”
“:

The European Space Agency’s INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) is an operational Earth satellite, launched in 2002 for detecting some of the most energetic radiation that comes from space. It is the most sensitive gamma ray observatory ever launched.[1]
Taken from Wikipedia