How habital would mars be if it was as big as the earth?

[ScienceRocks]

How habital would mars be if it was as big as the earth? Lets say it still had a hot core, which allowed for a magnetic field, an atmosphere of at least 700 millibars and current volcanic activity.

Consider this, Based on the curiosity data mars used to have seas on the surface of the planet. I'd imagine a earth sized mars like Kepler 186f or Kepler 1229b would also have oceans with this in mind. Kepler 442b shouldn't have any problem at all.

 

[Bleipriester]

How habital would mars be if it was as big as the earth? Lets say it still had a hot core, which allowed for a magnetic field, an atmosphere of at least 700 millibars and current volcanic activity.

Consider this, Based on the curiosity data mars used to have seas on the surface of the planet. I'd imagine a earth sized mars like Kepler 186f or Kepler 1229b would also have oceans with this in mind. Kepler 442b shouldn't have any problem at all.

I really support your future visions but when you are going to elect criminals spending your tax money on terrorists and maintaining an over-funded military, while even the infrastructure declines, how will this ever come true?

In addition to the aforementioned items, the US public seems not to be very interested in NASA stuff anymore and the politicians´ will to show the world that the US is number one in the space is dwindling as only Russian space crafts are available to bring people into the space anymore.

If man is ever ready to cooperate in r&d, the US must overcome its urge to control every inch of the earth at first.

 

[SixFoot]

If Mars were as big as the Earth, it would likely still have a molten core, with a working magnetosphere, and be teeming with life.

 

[konradv]

If Mars were as big as the Earth, it would likely still have a molten core, with a working magnetosphere, and be teeming with life.

But what level of life? It would be significantly colder and without a large moon would have a much more variable climate due to rotational wobble.

 

[SixFoot]

If Mars were as big as the Earth, it would likely still have a molten core, with a working magnetosphere, and be teeming with life.

But what level of life? It would be significantly colder and without a large moon would have a much more variable climate due to rotational wobble.

We base that hypothesis off of the only solar system we've ever seen, though. If Mars were as big as Earth, it wouldn't exclude the possibility of a thicker, therefore warmer atmosphere.

As far as the axial tilt goes, Mars already has an almost identical tilt to us (seasons and all). Who knows, maybe it would've taken this long for semi-intelligent, or even just complex microbes to form due to what we may view as a wild rotational wobble, maybe they would've had a few unknown factors that would have aided their progression faster than ours (perhaps a higher percentage of heavy water than Earth). No idea, but again, we only have one sample to go off of.

Too many variables change just by the location alone, but if the only difference in the last 4 billion years was the size/mass of Mars, I think there would be at minimum, animal life of some sort like our ancient tetrapods, or at least fish in the oceans, not just microbial.