article_snippet.sent: The list shows the various steps two astronauts on board had to go through when opening and closing the hatch to space .
article_snippet.sent: Shown is the first page of the checklist (left) and the Suit Integrity Check (right) for the spacecraft .
article_snippet.sent: On the left is part of the checklist used for leaving the spacecraft, and on the right, part of the checks the astronaut leaving had to go through .
article_snippet.sent: Checklists from space missions are said to be highly collectable items because Checklists from space missions flew in space and were so vital to the astronauts.
article_snippet.sent: The checklist was vital for making sure things didn't go wrong and things didn't get sucked out into space. '