Essential Guide to the EU – Chapter 2
Magnetic and Electric Fields in Space

2.1 The Strength of Gravity and Electric Forces Gravity is a relatively very weak force.  The electric Coulomb force between a proton and an electron is of the order of 1039 (that’s 1 with 39 zeros after it) times stronger than the gravitational force between them. We can get a …

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Shots in the Dark Part Two

Sep 20, 2011 The previous Picture of the Day described several of the many myths that refer to a celestial chain of arrows or a celestial ladder. It asked, how is this theme to be explained? A significant pointer is the realisation that stories concerning the arrow-chain form a subset …

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