PCS 182 Lecture Notes - Lecture 3: Self-Replicating Machine, Milky Way, Interstellar Travel

• School: Ryerson University
• Department: Physics
• Course: PCS 182
• Professor: Margaret Buckby

Document Summary

Fundamental or basic time unit: for humans: 1 second, for nucleons: 10-21 second, co(cid:374)side(cid:396) the hot su(cid:396)fa(cid:272)e of neut(cid:396)o(cid:374) (cid:862) ta(cid:396)(cid:863), energetic nucleons collide and form massive nuclei, these massive nuclei contain ~10,000 particles. Examples are gamma rays or x-rays: more information is stored in short wave lengthens, entire civilizations rise and fall during our coffee break. Interstellar travel by organic life forms (finite lives) is probably impossible: pioneer 10 probe took about two years to reach jupiter. If pointed toward alpha centauri system (4. 4 ly away), and the trip would last 1115, 000 years. Life simulants: the von neumann machines are able to consume resources and produce waste, they also are able to reproduce , colonize, evolve(via small reproduction errors, overwhelm organics?????, become dominant life forms in milky way galaxy. O(cid:374)(cid:272)e lau(cid:374)(cid:272)hed (cid:271)(cid:455) a (cid:272)i(cid:448)ilizatio(cid:374), the vo(cid:374) n(cid:859)s (cid:272)ould (cid:395)ui(cid:272)kl(cid:455) (cid:396)epli(cid:272)ate a(cid:374)d i(cid:374)(cid:448)estigate ou(cid:396) galaxy: calculations - mw exploration complete in a few million years.