Photo: Gay Young Students at Kumeyaay Elementary in San Diego built 3-D models of a Mars colony, which their teacher later collected and combined to create a Mars city. Photo: Gay Young Students at Kumeyaay Elementary in San Diego built 3-D models of a Mars colony, which their teacher later collected and combined to create a Mars city. February 19, 2021 Science teacher Gay Young has followed just about every space expedition in recent memory. This week, she’s taking her elementary students on the journey with her, as NASA’s Perseverance rover touched down on Mars after a seven-month flight from Earth.