I agree with the sentiments of John Bowdre.

I agree with the sentiments of John Bowdre. I believe science is at its best when its humble and when scientists are excited to acknowledge past theories were wrong.

This very short article points out that a leading theory for Mars’ liquid-water past — heating due to a thick CO2 greenhouse effect — is contradicted by surprising lack of carbonate rock in Curiosity’s searches.

So, what instead caused Mars to be warm enough for liquid water in its ancient history? Far from my expertise, I don’t know. But I’ll certainly keep my eye open for alternative theories.

Originally shared by Jack McDonald Burnett

How did Mars have liquid water, cold as it is? A leading theory has been disproven. Via Jess Nut​

https://www.google.com/amp/bgr.com/2017/02/06/mars-rover-news-curiosity-water/amp/

9 replies on “I agree with the sentiments of John Bowdre.”

  1. I think that at one point, Mars had a magnetic field that could shield the planet’s atmosphere from the solar wind. Then, there would be an atmosphere thick enough and warm enough to allow for liquid water.

  2. Just thinking with my fingers, here… Well, I do know why the core cooled. It cooled due to its lack of maintenance caused by its size. The atmosphere then depleted therefore so did the magnetic field, allowing solar winds to dry up the water that had existed. So, it must’ve had a thick enough atmosphere to sustain water at some point. Why, I’m not sure, either.

  3. Scott Dunn That’s pretty much what the old theory said, with the additional detail that the thick warm atmosphere was largely CO2 (like the early Earth) but the lack of carbonates seems to disprove that.

  4. If Mars is anything like the earth when it formed 4.5 billion years ago it may have been heated by the radioactive decay of certain isotopes in the mantle and crust. But since it’s only half the size of the earth that source of heat may have radiated away, even though those elements are still present. Just a guess.

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