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Okay, I'm a little behind on news, but I thought this story was extremely cool: Voyager 1 passes 100 AU from the sun. I guess this is only of interest to you if you're a space and astronomy geek.

(Some quick Wikipedia references: Voyager 1, AU.)

It's just amazing to me that a spacecraft built with 1970s technology has been able to go so far and outlast a lot of other junk that's been introduced to the world since then. It's currently the most distant man-made object from Earth. Signals from the spacecraft take more that 13 hours to reach us.

The spacecraft [both Voyagers] are traveling at a distance where the sun is but a bright point of light and solar energy is not an option for electrical power. The Voyagers owe their longevity to their nuclear power sources, called radioisotope thermoelectric generators, provided by the Department of Energy.

Voyager 1 is now at the outer edge of our solar system, in an area called the heliosheath, the zone where the sun's influence wanes. This region is the outer layer of the 'bubble' surrounding the sun, and no one knows how big this bubble actually is. Voyager 1 is literally venturing into the great unknown and is approaching interstellar space. Traveling at a speed of about one million miles per day, Voyager 1 could cross into interstellar space within the next 10 years.

Via Slashdot.

An idea, and a question (or the other way around). I've always liked astronomy; growing up I had several astronomy books and a small telescope, I eagerly consumed news and information about space (I had a newspaper photo clipping of Saturn as taken from Voyager taped to my wall), and I took Astronomy for my physics elective in college, and one thing that always struck me was how outdated the various books I had were, even though they were relatively new (at the time I got them). You would read some theoretical composition of Jupiter's atmosphere even as data was coming in updating and contradicting the old information.

So I was thinking the other day of the planet Pluto and how it has three moons now (I don't remember the context), and how this information could potentially change some fundamental conception of the solar system, and yet it would probably take a year, maybe 18 months before this would make it into the latest and greatest book on astronomy. And I thought, wouldn't it be neat if there was an open (as in open source) astronomy book online somewhere, maybe like a wiki, that was textbook-quality and was kept up-to-date with the latest discoveries? People could freely access it, print it out, download a copy, whatever, and it would always be relevant.

The question: Does such a thing exist already? Now, I'm familiar with Wikibooks, the self-described "open-content textbooks collection," but their Astronomy book is paltry at best. (It might make a good starting point, though.) So does anyone know of something like this?

If not, I might start it myself. It would make a neat hobby, at the very least.

(And if it worked, this would make a good model for other books that could be open and possibly wiki-fied. I've got a few ideas.)