23rd
The Scale of the Universe ☞ Planck length up to the entire universe (interactive visualisation)
“Space is big. You just won’t believe how vastly, hugely, mind- bogglingly big it is. I mean, you may think it’s a long way down the road to the chemist’s, but that’s just peanuts to space.”
— Douglas Adams, The Hitchhiker’s Guide to the Galaxy

Click image to explore
Zoom from the edge of the universe to the quantum foam of spacetime and learn the scale of things.
The Powers of Ten (1977)
“Powers of Ten takes us on an adventure in magnitudes. Starting at a picnic by the lakeside in Chicago, this famous film transports us to the outer edges of the universe. Every ten seconds we view the starting point from ten times farther out until our own galaxy is visible only a s a speck of light among many others. Returning to Earth with breathtaking speed, we move inward- into the hand of the sleeping picnicker- with ten times more magnification every ten seconds. Our journey ends inside a proton of a carbon atom within a DNA molecule in a white blood cell.”
See also:
☞ The Scale of the Universe (documentary)
☞ Planck scale, Wiki
☞ Observable universe, Wiki
☞ The Universe By Numbers - The Physics of the Universe
☞ The Scale of the Universe, University of California, San Diego Center for Astrophysics & Space Sciences
☞ Alasdair Wilkins, These are the biggest numbers in the universe
☞ Universe tag on Lapidarium notes
☞ Universe tag on Lapidarium