Monday, May 21, 2012

Our Indispensable Moon

Caught a documentary on The Science Channel early the other morning (first broadcast back in 2011 on BBC Two).



Space scientist and "lunar fanatic" Dr Maggie Aderin-Pocock explores our intimate relationship with the Moon. Besides orchestrating the tides, the moon dictates the length of a day, the rhythm of the seasons and the very stability of our planet.

Yet the Moon is always on the move. In the past it was closer to Earth and in the future it'll be farther away. That it is now perfectly placed to sustain life is pure luck, a cosmic coincidence. Using computer graphics to summon up great tides and set the Earth spinning on its side, Maggie Aderin-Pocock implores us to look at the Moon afresh: to see it not as an inert rock, but as a key player in the story of our planet, past, present and future. Toward that end, the discovery of water on the moon is highlighted to powerful effect.

Another documentary (broadcast in 1999 on Discovery) entitled "If We Had No Moon,"
though obviously less up to date scientifically, delved deep into the "indispensable quality" theme.

An essay by Bernard Foing, Executive Director of the International Lunar Exploration Working Group, in Astrobiology Magazine online sums up the Moon's place (so far) within the human universe fairly succinctly:

"Finally, the Moon had a key role in the emergence of science, and in our understanding of our place in the universe. We saw the repetition of the phenomena of lunar phases, and we observed solar and lunar eclipses. These were big challenges to our understanding of nature, and a few astronomers were put to death because they weren’t able to predict the eclipses. This challenged us to develop accurate predictions for the motion of the sun and the motion of the Moon.

Studying the Moon helped us determine distances in the solar system and the size of celestial objects. By studying lunar phases, for example, people were able to determine how far the Moon is from the Earth, the size of the Earth, and our distance from the sun. More recently, the Moon was the terrain where the
space race took place between two political systems, allowing for great technical and scientific achievements. The Moon has inspired humankind to learn how to travel to space, and to bring life beyond Earth’s cradle."