Double Tidal Locking Pluto and Charon are mutually tidally locked. That is, they both present the same face to the other planet all the...

Three Orbital Tethers This post revisits  Orbital Momentum As A Commodity . But now I will examine these tethers using Wolfe's spread...

Kim Holder has been urging me to do this blog post. Her comments in various forums have been helpful in thinking about this. Vertical Lun...

Hilda Asteroids - Red ,    Sun Jupiter Trojans - Blue ,    Main Belt - Green The above image was made from screen captures of S...

There are proposals for rotovators to catch payloads in low earth orbit and then throw them to higher orbits. It occurs to me that rotovat...

This is the fifth in a series of posts using Chris Wolfe's spreadsheet to look at various elevators. 274,000 km Lunar Tether This ...

Malthusian growth model The Malthusian growth model sees population growth as exponential. P(t) = P o e rt where P o  =  P(0) is the...