Lets turn this into an intelligent debate!
There are more Moons in the universe than there are Planets, by orders of magnitude! Does this mean that when / if we ever find extra terrestrial life, will it be on an Earth Like Planet, or an Earth Like Moon? I would put money on a Moon instead of a Planet!
Venus - My porridge is too hot!
Earth - Perfect! Has Life
Mars - My porridge is too cold! More data needed.
More on Mars: perhaps once had life! But geologically, it is dead. Earth is the only planet, (remember planet) in our solar system that has Tectonic Plates! Tectonic Plates are a result of a core that remains hot enough to generate an electromagnetic field that protects us from Solar Wind, which would otherwise strip our planet of its atmosphere, like Mars. Earths magnetic field and molten core could very well be a result of our moon having such a strong gravitational influence on our planet, but this is not limited to planets, but could happen on moons as well, like the moons of Jupiter with its tremendous gravity. So one of Jupiter's 67 moons could easily have lunar tectonic activity, thus, an electromagnetic field (or even Jupiters) that shields it from Solar Winds, which is pretty much a life killer. Jupiter also has a very strong electromagnetic field, so it does not actually need to come from the celestial body itself.
Mars by comparison has two puny moons. Not large enough to have enough gravitation influence on the planet to cause tectonic activity or an electromagnetic field, like Earth. Electromagnetic Field died, and Solar Wind stripped the planet of almost all of its atmosphere, and now it is (theoretically) it is a dead planet, but may have once supported life!
Conclusion - Electromagnetic Field that shields from solar winds will maintain an atmosphere and is an essencial ingredient for life, not just being in the Goldilocks Zone.
Debate.
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Also...
I hate the way that Uranus is pronounced. I dont give a crap what the scientific community says, both "proper" ways of pronouncing Uranus is just disgusting. Your-anus. Duh. Alternatively, Urine-Us. Also disgusting. Pee on me or poop on me, those are your two choices. So I propose a new way of pronouncing it that is not disgusting. You-Ran-Us. Absolutely nothing disgusting there, and I think if enough people start pronouncing it in a different way, and screw the scientific communities way of pronouncing it, that it may eventually catch on and we can be rid off all the Star Trek jokes. Such as why did Star Fleet take Toilet Paper to Uranus? To get rid of "Kling-Ons"! Yuck!
Debate that too.