Lagrange Points:L4 and L5

English: Lagrangian points animated

Lagrangian points animated (Photo credit: Wikipedia)

Readers have asked me if the “L4” and “L5” nodes in my ebook Glitch are real.  Yes, indeed.  They are Lagrange (or Lagrangian) points.  Wikipedia has a technical article http://bit.ly/Dt8x on these nifty results of gravity in our solar system.  Or try Jake Turk http://bit.ly/1c7PIkv for a narrative combination of history and physics.  NASA already uses Lagrange points in space missions, so now you can watch for references to Lagrange points in the news

A contour plot of the effective potential of a...

A contour plot of the effective potential of a two-body system. (the Sun and Earth here), showing the 5 Lagrange points. An object in free-fall would trace out a contour (such as the Moon, shown). (Photo credit: Wikipedia)

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