Second lady Usha Vance and NASA astronaut Suni Williams championed the Summer Reading Challenge Vance launched earlier this year, at the Johnson Space Center in Houston.

“This is really exciting for me, because I love space, and I love NASA, and I can’t believe that I get to hang out with a real astronaut,” said Vance during the Monday afternoon event, which featured a joint reading from the book Margaret and the Moon: How Margaret Hamilton Saved the First Lunar Landing.