This video takes an interesting look into the past of the planet Mars.  Currently it has no atmosphere and the theories of why this is the case are all over the place:

For decades, planetary scientists have suspected that ancient Mars was a much warmer, wetter environment than it is today, but estimates of just how much water Mars has lost since its formation vary widely.

What do you think?  Was there a phenomenon in our solar system that caused this or something else?

Let’s find out more in the video on the next page

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