Let's make this birthday one to remember.

73 years old (Born on September 30, 1951)

Happy Birthday, Simon! Another orbit around the sun completed—though as an astrophysicist, you're probably keeping track better than most of us. Your stellar leadership at the Max Planck Institute has illuminated our understanding of galaxies and dark matter; clearly your brilliance outshines even a supernova.

May this year bring you more cosmic discoveries (and fewer black holes in grant funding). Keep inspiring us with your boundless curiosity and wit—we're convinced you've secretly cracked time travel because somehow you never age!

Here's to another fantastic journey through space-time filled with laughter, success, and perhaps finally locating those elusive missing baryons. Cheers!