Classroom Questions Questions for ‘Welcome to moon rock central’ Science News astronomy reporter Lisa Grossman visits the pristine-sample lab at NASA’s Johnson Space Center in Houston. The display case holds rocks collected by the Apollo 15 and 16 missions. The 1.5-kilogram (3.3-pound) chunk of volcanic basalt in the center is 3.4 billion years old. Felix Sanchez Share this:FacebookTwitterRedditGoogle ClassroomEmailPrint By Science News for Students September 5, 2019 at 5:30 am Classroom questions are available for free with registration. Learn more Register to access: Client key* E-mail* Log in Already Registered? Enter your e-mail address above.