Friday, October 4, 2013

Gravity (Movie)

   Excellent hard science fiction movie that I've seen thus far this year.  Appears generally well written using survival story theme, but not atypical relative to other survival movies...that is, not one using the theme of alien invasions, or having landed on some remote hostile alien world, and so forth.
 
In case you might have wondered about the velocity of the debris field as depicted in the movie...keeping in mind, is an orbit relatively the same for a particular body mass relative another, there may be smaller difference in relative velocities between the two.  It may be possible for two body masses to hold some manner of stable orbit, yet have major differentials in relative velocities (not sure about that depicted in the movie...for instance, differences in orbital planes between two body masses, the other, possibility when the eccentricity of the orbit between two body masses are different...a less then circular orbit relative one closer to zero eccentricity means that relative velocities may be increased at both periapsis and apopsis altitude, if the debris field, for instance, were to coincide its trajectory at a particular orbital track at periapsis altitude largely eccentric orbits may have fairly significant relative velocities differential)...one way of one craft intercepting another craft is by changing the periodicity of the orbital track simply adjusting ap/pe altitudes.

You can simulate this stuff by the way with Orbiter 2010 software online.

Space junk/debris presently is something that is tracked by the way, and is considered an issue especially in the future of near earth orbital space flight.  

See also Space debris

Add a visual of orbital debris...the movie refers actually to the scenario possibly called 'Kessler syndrome' where a run away chain of events critical mass of debris causes a chain reaction 'pulverization', it is at present a debatable subject but not reserved in possibility strictly to fantasy (or beyond realism).

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