Let's make this birthday one to remember.

64 years old (Born on December 14, 1960)

Happy birthday, Catherine Coleman! Hope your celebration is simply out of this world—though you've already done that better than anyone else we know. Spending 159 days floating blissfully aboard the International Space Station puts you firmly in the starry hall-of-fame; chemist by trade, astronaut by accomplishment, space resident extraordinaire.

Every trip around the sun counts—even when you're orbiting Earth every ninety minutes—but today gets extra credit for bringing us someone who truly redefined chemistry experiments at zero gravity. May your earthbound day be as delightful and free-floatingly fun (minus any spilled beverages!) as Expedition 27 memories remain timelessly stellar!