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I'm a novelist and have an interest in space science and physics. I've been a programmer for more than 40 years and I like reviewing new and up-and-coming authors. I have become a committed member of the OpenSimulator community.
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Surface Gravity Calculator
Want to know what the surface gravity is on any celestial object? You just need to know it's mass in terms of Earth masses (e.g. Earth = 1, Venus = 0.815, Mars = 0.107 etc.) and it's radius. This calculator will do the rest.
Calculate your Age and Weight on the Planets
This little calculator allows you to calculate how old you would be on each of the planets in the solar system, and what your weight would be. If you have weight issues, don't look at the result for Jupiter! 
The results are based on surface gravity, which for the gas and ice-giants is somewhat less than you might think. Data is taken from NASA/JPL
N.B. None of this information is stored or even sent to my server, it's calculated in your browser
Magnetic Field Lines on a Galactic Scale
The Cigar galaxy (M82) is already famous for the speed at which it creates new stars. The composite image shows the powerful magnetic field lines on a truly epic scale, wrapping around the entire galaxy. NASA's SOFIA observatory (Stratospheric Observatory for Infrared Astronomy - a converted Boeing 747) has shed light on what is happening.
How do I Calculate Distance from Period?
I've been asked how Orbital Calculator can calculate the distance an object is from a gravitational mass, using just its period (the time it takes to complete an orbit). The technique is relatively simple, so I'll explain it.
