NATS 1880 Lecture Notes - Lecture 13: Konstantin Tsiolkovsky, Fermi Paradox, Interstellar Travel

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All heading out of the solar system w/ messages (except new horizons) & unlikely to be found. *distance: spacecraft today is only 120 au from the sun after decades of travel. Alpha centauri: 270,000 au from the sun (takes voyager 100,000 yrs to reach) Cosmic speed limit: spacecraft can"t go faster than speed of light (300,000 km/second) Example: 100,000 light years away -> would take a minimum of 100,000 years to travel (and this is travelling at the speed of light) Energy challenges: * energy of moving object = objects mass + desired speed2. Kinetic energy: 1/2mv2 (1/2 mass x velocity 2) (2 centuries of energy & too expensive) Energy example: 1000 ppl -> 100 m kg starship -> 10% sp. o light (40 years) to nearest star -> require 100x world"s current annual energy use. *newton"s 3rd law of motion: rocket principle (conservation of momentum) Rocket equation: mo/m = e v/ve (rations of mass & velocity*)

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