The Earth’s Moon is most unusual, it is very large, yet its mass is very low, but this is exactly what is needed for life on Earth. How the Moon originated was a profound mystery until the Apollo Astronauts brought back lunar rock samples; these showed that the Moon was formed in a huge collision with a planet about the size and mass of Mars early in Earth’s history.

Almost all collisions between planet-sized bodies leave behind nothing but a lot of debris, as in the asteroid belt. However, the angle and speed of this collision were exactly right to permit the two planets to just barely disintegrate and to allow the more massive Earth to extract the core and heavy elements from the smaller planet before recollecting into their present forms. This process super-enriched the Earth with metals and left behind a moon with the characteristics needed by advanced life.

Our Moon does three things that are absolutely essential for advanced life. The first and most important of these is the stabilization of the Earth’s axial tilt. The equator is tilted approximately 23.5 degrees to the plane of its orbit around the sun. This permits the Earth to enjoy a stable climate and maintain liquid oceans over vast periods of time. Without a massive moon like ours, the gravitational tug-of-war between the Sun and Jupiter would cause the Earth’s axial spin to gyrate wildly. This would be disastrous for life.

Second, the Moon also regulates the oceans’ tides. The tides play a number of important roles in the maintenance of life, including the Carobonate/Silciate Cycle and Plate Tectonics.

Third, the Moon acts as a break on the Earth’s rotation rate. It has slowed the planet’s spin at exactly the rate needed to maintain the necessary temperature, wind velocity, and other factors required to properly regulate the greenhouse gas environment without triggering a runaway greenhouse effect. This is part of the phenomenon known as the “Solar Luminosity Paradox” which is far too complex to be dealt with here but is also an inexplicable miracle.

SETI (Search for Extra-Terrestrial Intelligence)

This most unusual collision event created a profound question for those searching for extraterrestrial intelligence. How common are such collisions? If higher life forms require a moon like ours, what are the chances of a collision like the one that formed the Moon happening again?

To answer these questions researchers at the University of Florida, the Seward Observatory in Tucson, and at the European Southern Observatory in Santiago, Chile conducted an examination of a star cluster known as NGC 2547. Collisions of the type that formed the Moon leave behind a gigantic dust cloud and are detected easily. The purpose of the examination was to look for the dust cloud left behind by such a collision. NGC 2547 holds about 400 stars and is the right age for the desired stage of planet formation. Of the 400 star systems examined, only one showed evidence of having once had a planetary collision event. This led the researchers to conclude that any type of planetary collision is very rare, especially one that is just right to leave behind an object like our Moon.

Why This Is Significant

The presence or absence of life on other planets is not a theological problem for Christians. If God created life here, He can certainly do it elsewhere. But to those who believe that life originated solely thought a natural process, with out the need of God, the discovery of extraterrestrial life is an essential element of their faith. They theorize that the natural processes that brought about life on Earth should produce life on other planets when the conditions are the same. They believe that the Earth is not special, and there is no God; therefore, life should be common in the Universe. This claim was famously repeated ad nausium by Carl Sagan. This idea drives SETI and its ancillary programs such as the desperate search for evidence of large amounts of liquid water once having been on Mars.

The discovery that the Moon is indeed a very rare and perhaps unique object in the Universe does not support the expectations of the SETI theorists and their assumption of “a Universe loaded with intelligent life.” The Earth – Moon system is finely tuned to a stunning level of specificity. A billion things had to go just right at the right instant for the Moon to have come into existence. The chance of this happening even once as the result of a random natural event is so vanishingly small as to be in effect Zero.

Sources:
1. “A Moon Like Ours Is Rarely Formed”, The American Institute of Physics Bulletin of Physics News: Phillip Schewe and Jason Bardi, Dec 5, 2007, No.

2. “Debris Disks in NGC 2547”, The Astrophysical Journal: Nadya Gorlova, et al., Nov.

By: Lawrence Vescera, Ph. D.