Astronomy 2021A/B Lecture Notes - Lecture 13: Liquid Rocket Propellant, Bomb, Inverse-Square Law

• School: Western University
• Department: Astronomy
• Course: Astronomy 2021A/B
• Professor: Alyssa Gilbert

Document Summary

We"ve sent humans to the moon 4. 5 days there 4. 5 days back again. Pioneer 10 1972 2003, lost contact @ 80au, directed at jupiter and saturn, contained drawing of man and woman and our solar system lay out, took 21 months to get to. Jupiter, at that speed, 115,000 years to get to alpha centauri, really it wont pass closer than 3. 3 ly to any star in the next million years. Voyager 1: 1977 now, @ 134au (heliopause) more sophisticated messages, poctures, multilingual greetings, and two dozen musical selections on a gold plated copper record. Voyager 2: 1977 now @ 110au. New horizons: 2006 now, pluto (40au) Kinetic energy: mv^2: requires a lot of energy to get massive things up to high speeds. Energy required to put an object in motion depends on only two things: the objects mass and the speed at which you want it to move.