You've probably never heard this example in discussions about the basic requirements of extra terrestrial life. But our moon isn't just a pretty dot in the night sky -- it helps make life possible. And as far as we know, no other planet in the universe has anything like it. The more we learn about our solar system, the more we recognize our moon's uniqueness. The moon is the earth's only natural satellite. Mercury and Venus have no satellites, and Mars has only two very small moons. The gas giant planets -- Jupiter, Saturn, Uranus, and Neptune -- have many satellites, in excess of 150, and more likely will be found. However, most of the satellites (and all the recently discovered ones) are very small compared to our moon.
Why did God make a unique moon? Since the first night Adam stared up at the starry heavens, he must have marveled how the "lesser light" illuminated his otherwise dark nights. In recent times, astronomers have discovered other benefits of the moon, which helps to regulate living conditions on the earth. As far as we know, no other planet in the universe has such a perfectly matched satellite.
When compared with the mass1 of the earth, the moon is very large. While some of the satellites of Jupiter and Saturn are more massive than our moon, those satellites aren’t very large when compared to the size of their respective planets. Unlike most satellites in the solar system, which orbit above the equators of their respective planets, the moon orbits in the same plane as the earth orbits the sun.
[Read the rest of the article at Answers in Genesis.]