The Genesis Rock, foreground, a 4.4 billion year old anorthosite rock, approximately 2 inches in length, brought back by Apollo 15 and used to determine the moon was formed by a giant impact, sits under glass inside a pressurized nitrogen-filled examination case as Lacey Costello, an Apollo sample curation processor, works with other samples on the outside of the case inside the lunar lab at the NASA Johnson Space Center Monday, June 17, 2019, in Houston. (AP Photo/Michael Wyke)