What about the possibility of interplanetary biological contamination? Is the desire to terraform worth the risk of harming indigenous life forms?

But if the scientists can really hone in on a game plan, we could have a proper plan in place to terraform Mars sometime down ...

Depending on whom you talk to, terraforming could take anywhere from ... The lack of gravity may cause humans on Mars to evolve differently than on Earth. Mars has one-third the gravity of Earth ...