We finally got round to exploring one of the Astronomy Picture of the Day posts that I've been meaning to get to for a long time. This is an interactive animation that allows one to scroll either up or down in size from the size of a human. The two extremes are Planck length, or the smallest measurement of length that has any meaning (anything smaller and quantum effects rather than classical gravity effects dominate), and at the other end of the scale, the extent of the observable universe. In numbers, this goes from 10^(-35) m to 10^27 m. Along the way we see, amongst other things, quarks, atomic nuclei, bacteria, insects, animals, countries, asteroids, planets, stars – from dwarf stars to supergiants, galaxies, clusters of galaxies.