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What is the cosmological constant that is denoted by Greek letter Lambda and apparently has a value of 1.38*10^(-122)? What is the mystery surrounding that number?

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What is the cosmological constant that is denoted by Greek letter Lambda and apparently has a value of 1.38*10^(-122)? What is the mystery surrounding that number?	5
Why aren’t any stars visible in the iconic ‘Pale Blue Dot’ photograph taken by Voyager I?	1