Explaining The Universe on Instagram: "An ellipse is a smooth, oval-shaped curve formed by all the points where the sum of the distances to two fixed points, called foci, remains constant. Unlike a circle, which has one central focus, an ellipse has two, and its shape depends on how far apart they are. The longest line through the ellipse, called the major axis, defines its length, while the shortest line across it, the minor axis, defines its width. This balance between the two axes gives the e