In 1995, scientists pointed the Hubble Telescope at an area of the sky near the Big Dipper. The location was apparently empty, and the whole endeavour was risky – what, if anything, was going to show up? But what came back was nothing short of spectacular: an image of over 1,500 galaxies glimmering in a tiny sliver of the universe. Alex Hofeldt (with animation by Bliink) helps us understand the scale of this image. Even after you have watched this extract from Hofeldt’s Ted-Ed lecture it is unlikely that your head will stop spinning with the enormity of the universe.