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 [...]
Joseph Amundsen’s recent Cosmic Quiz Question asks why the flags placed on the moon by the Apollo astronauts appear to be flapping in the wind.
The short answer is no one really knows. Dark matter is a name given to something that, so far, has only been detected by the gravitational force that it exerts on visible matter and light. In fact, that gravitational force is the evidence for dark matter.
A quick look at “Average Orbital Velocity” in Clark Planetarium’s [...]
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