I am sure you already know about this Tim but maybe others here have not heard this yet. They just discovered the tenth planet in our solar system (unamed yet)I had heard that some had predicted this for years but it did not get accepted by main stream astronomers. I guess all the textbooks will now have to be rewritten.
And you will have to start a new preset bank for m42 in honor of this new discovery.
http://www.nasa.gov/vision/universe/sol ... 72905.html