Mars 6?

Card	Mars 6
Set	Planets
Edition	Puzzle
Book value	Est. 8 to 20 Credits once graded
Checklist	73 / 90
Rarity	Common
Owned	1

Mars, piece 6 of 9

The air on Mars is mostly carbon dioxide and so thin that its pressure is less than one percent of Earth's. Liquid water cannot stay stable on the surface today.