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...e hypothetical use of nanotechnology sometimes called "green goo"|Glossary of nanotechnology#G}} ...es represent the range of the estimates while time is measured in billions of years ago (Ga). ...

{{Short description|Largest moon of Neptune}} ...phere. The bright, slightly pinkish, south polar cap at bottom is composed of nitrogen and methane ice and is streaked by dust deposits left by nitrogen ...

{{about|the number {{pi}}|the Greek letter|Pi (letter)|other uses of pi, π, and Π|Pi (disambiguation)}} The number '''{{pi}}''' is a [[mathematical constant]], the [[ratio]] of a [[circle]]'s [[circumference]] to its [[diameter]], commonly approximated ...