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- Full Moon: The moon appears fully illuminated and round. - Last Quarter: Half of the moon is visible, resembling a backward letter "D." - New Moon: The moon is not visible from Earth. - First Quarter: Half of the moon is visible, resembling a letter "D." - And so on...

NASA’s Perseverance Mars rover is filling sample tubes with rocky material on the Red Planet as the agency works on the next steps to get them safely back to Earth. The Mars Sample Return campaign would bring samples collected by the Perseverance rover to Earth for detailed study. The campaign involves an international interplanetary relay team, including the European Space Agency (ESA). These samples could answer a key question: did life ever exist on Mars? Aaron Yazzie, who works on the Mars Sample Return campaign, explains the work being done at NASA’s Jet Propulsion Laboratory to ensure the safe return of the sample tubes.