M121 Chap 2 addFields_stage.js type error

Hi all
there is a little mistake (typing error) on the second command of the file.

db.solarSystem.aggregate([{"$project": { “_id”: 0, “name”: 1, “gravity”: “$gravity.value” } }])’’

E QUERY [js] SyntaxError: missing ; before statement @(shell):1:95

db.solarSystem.aggregate([{"$project": { “_id”: 0, “name”: 1, “gravity”: “$gravity.value” } }]);

Hoping this is the right place where send these advices.

Thank you very much for pointing that out !!