Researchers picked Mars as an example to terraform because of the new information received from Martian probes revealing that at one point in time there may have been life on the planet, including running water. Mars compared with Venus, Titan (one of Saturn's moons), and Europa (one of Jupiter's moons) is just the right distance from the Sun in order for it to be not too hot but not too far to be frozen. Although the temperatures on mars fluxuate so dramatically (-100 F to 75 F) they are relatively close to the Earth's temperatures than any of the others.

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- A rotation of 24 hours 37 minutes (Earth: 23 hours 56 min.)

-An axial tilt of 24 degrees (Earth 23.5 degrees)

-A gravitational pull one-third of Earth's

-It is close enough to the sun to experience seasons. Mars is about 50 percent farther from the sun than Earth