Wednesday, February 24, 2010

*GETTING THERE*

*******************GETTING THERE*******************
Destinations

G-force acceleration to neighboring planets will take just days,

and comfortable Earthlike conditions (gravity, atmosphere, comfortable billets, entertainment, etc) will persist throughout the flight.

11. To Mars

Total Time=
Departure Time
+ Return Time
tTtl
=
{tAcc + tDec}
+ {tAcc + tDec}
tTtl
= {√(d/g) + √(d/g)}+ {√(d/g) + √(d/g)}
tTtl
=
4√(d/g)


Getting there with g-force acceleration requires special profile.

GETTING THERE:
Gotta speed up for first half of flight then slowdown for 2nd half.

GETTING BACK:

If you wanna come back, you gotta do the same thing again
(in reverse).


12. To Ceres. On the first day of the Nineteenth Century (January 1, 1801), Ceres was discovered by an Italian Catholic Priest; an irony greatly appreciated by those of us even slightly familiar with the story of Galileo Galilei, an Italian Catholic scientist who was imprisoned by the Catholic Church for just suggesting the nonuniformity of God's Universe.
Orbit of Ceres soon established it's location between Mars and Jupiter; thus, many thought it to further confirm Bode's Law, a pattern of numbers which seems to predict distance of planetary orbits from the Sun. Thus, Ceres was considered a planet for many years. Then demoted to the biggest of the asteroids; finally, promoted again to the smallest of the dwarf planets.

13. To Uranus

Since Uranus has the lowest escape velocity of the four gas giants, it might be the optimal mining site for He3. Mining operations would require a mix of artificial intelligence and human activity.

The most practical method to settle humans near Uranus might involve habitats as described by Dr. O'Neill, in his book, High Frontier. Such structures could be manufactured in a near Earth, Solar Orbit, then moved to orbit Uranus in its system of moons and rings.



These habitats could be very comfortable:
  • With the right amount of spin, cylindrical habitat could simulate Earth surface gravity.
  • Uranian He3 could provide plentiful energy.
  • Uranus probably has plenty of H2O for life support, agriculture, and so on.


    14. Keepers from Kuiper
    Commerical Enterprise(s) Many asteroids and many comets significant source of resources for extraterrestrial environments. "What's found in space, is used in space.." makes a lot of sense when you consider that Terran needs its resources plus exporting Terran resources means significant "lift off" costs. Commerical Enterprise(s) Don't know! It's a long way to Oort Cloud. It's a necessary step to interstellar, but it's a big step.

    15. Exoplanetary

    Beyond Kuiper Belt, a space vessel transitions into the vast exoplanetary space beyond the planets but well short of leaving the Solar System (1 year of g-force acceleration takes us less than half way to the Oort Cloud).
    a. Why go exoplanetary?? Oort Cloud has billions of comets with numerous megatonnes of frozen fluids needed for space travel. Space requirements are best satisfied by space resources.
    b. Propulsion System. Thought experiment assumes ship's propulsion system to be a particle accelerator which uses powerful magnets to manipulate plasma streams.
    c. Inflight Velocity. To consider relativity, recompute velocities as percentages of c, light speed. Use exponentials to compute exoplanetary velocities.

    vt = c(1-(1-Δ)t)d. Distance. To consider different way to compute distances.Use calculus to determine distance equation from above velocity equation.
    After integrating and some rearrangement:
    d(t) = ct +v(t)
    ln(1-Δ)
    e. Range. Daily recompute GW and corresponding fuel requirement.

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