Things I don't know: Why Contact Binaries Predominate
Wednesday, January 2, 2019 at 11:39PM
Dustan Doud

So, ever noticed how so much of the solar system seems to be rubble twin contact binaries?  I believe they outnumber other kinds, and the reasons why kinda excape me.  Like why two rocks?  Why not four or three or one as the most common lumpy shape for asteriods?  

I'm fairly certain the reasons happen to be some rather terrible dynamic calculation that sorts out to solar system formation dust density, disk radius theta and phi gradients, and temperature of the enclosing stellar nursery, stellar ionization vs radioactive electrostatics and long-post supernova galactic plasma/gas flows tempered by solar winds not to mention gravitation effects of Jupiter and the other gas giants coupled with the asteroid as a pile of gravel model that allows attractive tidal forces to squeeze and mash the asteroids themselves allowing the orbits to decay ever so gently as time ticks along and a just a dash of destructive bombardment.  

But I'm willing to settle on - maybe two is just a great number.  

New Horizons, congratulations on reaching Thule Ultima.  Chang'e 4, congratulations on touching the moon.  

Ultima I, The First Age of Darknesss was a game on old school computers.. I've played 1983's Ultima III Exodus.   Both titles seem situationally appropriate - New Horizons is in the twilight zone of our sun, drifting ever farther away into a long age of darkness before an exodus that eventually brings it back to another bright light in 50,000 years or so. Chang'e 4 on the far 'dark' side of the moon.  Mission is practically acomplished!   I think I need a tissue :)

Beautiful mission!   Goodluck in 2019-52019 all!  (Go New Horizons! Go Chang'e 4!  Two is a great number.)

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