The New Horizons spacecraft is on its way to Pluto. It left Earth back in January 2006. Now it is almost halfway between the orbits of Saturn and Uranus. When will it reach Pluto? Not until July 2015. Why so long? Pluto is “out there.” How “out there” is it? A scale model can help.
A few days ago, I needed to increase the size of an astronomical table to make it easier for my aging eyes to read. It was about half the size of a standard sheet of paper, so I decided to double its size. What scale setting should I use on the copier, 200%? Having been [...]
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