βοΈ What if Mars had Earth's gravity?
A thicker, longer-lived atmosphere β Mars' biggest problem gets smaller.
The science
Mars likely lost its atmosphere partly because low gravity (0.38g) plus no global magnetic field let the solar wind strip it. With 1g, Mars would hold gas far better, making a thicker atmosphere and stable surface water far more plausible.
Immediate consequences (modelled)
A visitor would weigh the same as on Earth (try the Gravity Laboratory).
Possible long-term consequences (hypotheses)
A denser atmosphere could warm Mars via greenhouse effect, though its greater distance from the Sun still means cold.
Assumptions: Gravity changed via added mass; solar distance unchanged.
Limitations: Does not model climate, geology, biology or engineering in full detail.
Reference: NASA / peer-reviewed planetary science