SCIENCE Voyager 1, a NASA spacecraft launched 36 years ago, is approaching the very edge of our solar system—a mysterious boundary called the heliosphere. (Nat Geo News) Read our short article and watch this three-minute video to learn a little about the Voyager missions and why this is such a tremendous moment in exploration. Discussion Ideas Watch our video on “Space Probes,” which describes the … Continue reading Now, Voyager: Spacecraft at Gateway to Galaxy