Mars or Earth?

[simato73]

The Red Planet is here...

[Alaun]

Seems good enough for a mars mission fake. But pre-mission published pictures are a bit problematic. 

[David H. Hartman]

Take a deep breath (or any breath). You'll know. 

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It's a great photograph: I like it!

Dave Hartman

[simato73]

Take a deep breath (or any breath). You'll know. 

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It's a great photograph: I like it!

Dave Hartman

Thanks!
The air was thin, but not Mars thin.

[David H. Hartman]

 

[Bill De Jager]

The air was thin, but not Mars thin.

Mauna Kea?

[Akira]

Thanks!
The air was thin, but not Mars thin.

...and the gravity is not thin either.  I like the (kind of) rhyme, too. 

[simato73]

Mauna Kea?

Much closer to home
Although, still a volcanic island: this is the Pico Viejo crater of El Teide, in Tenerife (Canary Islands)

[Olivier]

The beating heart of the volcano... Very nice!