I think the biggest issues are surface gravity and surface air pressure. Mars' surface gravity is about 38% of Earth's. It means the planet just doesn't hold its atmosphere that well. It will lose over half its air molecules to space in less than a 100,000,000 years. That sounds like a long time, but over a couple of billion years, everything gets lost. The current surface air pressure is only 1% of Earth, and it's almost all carbon dioxide. The carbonate rocks are outgassing, maintaining the thin atmosphere. To get the full Earth's air pressure at 38% gravity, you would need more than 2.5 times the mass of air above your head. Doable, but if you make the leap to change more than just the surface of Mars, why bother?"Matt paused for a moment, then continued. "Our baseline design now has us bringing the planet to full Earth gravity and air pressure by adding hundreds of billions of cubic kilometers of silver and iron and slightly radioactive heavy metals at the core. The radioactive. She was smiling. The kiss was awkward, but slow and loving. Evidently, she remembered too.Pouring a gobbet of shampoo on my left hand, I spread it across both palms by rubbing my hands together and began to work it into her thick hair. While I shampooed her, I wondered what this was all about. Both of us had been clean and sweet smelling when we'd met this evening and neither of us had engaged in any particularly athletic activities since. Theoretically, we didn't need a shower. At the same time, I dearly loved to make love to my woman with nice, hot water pelting down on us."You used to want me to shower with you more... before," Sherrie said quietly. "I wish I'd listened to you and hadn't been so stupid about it," she added regretfully."We can make up for lost time," I suggested. I was rinsing her hair under the showerhead so the reply was a while in coming."Okay," she said happily.I worked some conditioner into her hair, giving her a scalp massage at the same time, and rinsed it.
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