Mars will be discovered very soon for humans to live on. The amount of time it will take Elon Musk to figure out how to get there will be a very short period of time if you take into account all of humanities innovations over the past few decades. The centuries become very short when you realize your timespan on earth. Take that into account the next time you visit another planet. Christians will be aware of the phone calls you can make to Mars because it will cost a lot for long distance.