Let's make this birthday one to remember.

54 years old (Born on July 28, 1970)

Happy Birthday, Colonel Behnken! You've soared higher than balloons and candles combined—after braving thrilling skies as a military test pilot and boldly exploring space aboard Endeavour for STS-123 and STS-130. Not many people celebrate their birthday orbiting Earth at thousands of miles per hour; surely cake doesn't taste quite right in zero gravity?

From mastering fearless missions with NASA to testing the very limits of courage (and possibly humor) beyond Earth's atmosphere, your journeys have inspired us all. Here's wishing you another year filled with adventures that are literally out-of-this-world—and may your next spacewalk feature cosmic party hats!