During Apollo 15, fifty years ago this summer, astronauts James Irwin and Dave Scott found a rock on the Moon that became known as the Genesis Rock. Originally it was thought to be a piece of the Moon's primordial crust. That lunar sample along with most of the over 800 pounds of rocks Apollo astronauts brought back from the Moon are housed at Johnson Space Center in Houston, Texas, where they are still studied today. Join us for a live chat with planetary scientist and lunar sample curator Ryan Zeigler and and senior scientist Andrea Mosie, who oversees Apollo lunar samples. What questions do you have about Moon rocks?

Tune in to the webcast on this page or watch on Facebook Live on the National Air and Space Museum Facebook page.

This program is made possible through the generous support of Boeing.