The Shape of Ursa Major in Three Dimensions FriendsofNASA.org: This visualization reveals the stars of the Ursa Major constellation in three dimensions. Watch as the familiar pattern on the sky distorts into a whole new perspective. At the start of the sequence, the camera pans upward to the asterism known as the "Big Dipper". Five of these seven stars—Mizar, Alioth, Megrez, Phecda and Merak—have similar speed and motion across the sky, and belong to the Ursa Major Moving Group. The camera then