They've already landed men on the moon, so why not Mars?
Back a number of years(May 1991) there was a real interesting article in "LIFE" magazine.
It was a plan to make Mars habitable. Now that would be quite an acheivement!
They figured it could be done over a 150 year period.
First they would send orbiting solar reflectors to circle Mars and melt the ice caps.
They would set up factories to produce green house gases and ozone type material.
As the planet warmed, nitrogen and water would seep out and the atmosphere would thicken.
This would cause more warming, clouds would appear, eventually causing rain.
Then they would set up factories to extract oxygen from carbon dioxide and other carbonated materials.
Next they would plant tundra plants and hardy evergreens.
These would help the atmosphere.
They would build glass dooms since the atmosphere was still maturing and could not yet support human and animal life.
But as more and more plants are planted and the factories kept pumping out more oxygen by 2170 they figured Mars could be habitable!
Now --
I don't think this world will last that long, much less will they develop another planet.
But possible AFTER the 1000 years, when this earth is made new -- maybe Mars will also be made habitable.