When you rotate a cube in three-dimensional space, its shadow on a flat surface looks like a square, changing and deforming as the cube turns. That shadow isn’t the cube itself, but a 2D projection of it. Now imagine doing the same with a 4-dimensional cube, also known as a tesseract. When it rotates in 4D space, what we would see in our 3D world is its shadow, a cube that appears to deform, stretch, and fold into itself. Just as the shadow of a cube hides one full dimension, the shadow of a tes

This visualization provides a three-dimensional perspective on Hubble's 25th anniversary image of the nebula Gum 29 with the star cluster Westerlund 2 at its core. The flight traverses the foreground stars and approaches the lower left rim of the nebula Gum 29. Passing through the wispy darker clouds on the near side, the journey reveals bright gas illuminated by the intense radiation of the newly formed stars of cluster Westerlund 2. Within the nebula, several pillars of dark, dense gas are bei