Did Mars ever have an atmosphere?

Related questions

1. Did Mars ever have a magnetic field?
2. What atmosphere do we live in?
3. Does Mars have an atmosphere?
4. How Ozone is formed in the troposphere?
5. Where does the greenhouse effect occur?
6. Is it possible to create an atmosphere?
7. How do greenhouse gases cause global warming?
8. How did Earth develop an atmosphere?
9. What is atmosphere short answer?
10. Was there life on Mars in the past?

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