11: Things move, unless they don’t
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Newton's laws & how things move Newton's 3 laws of motion (livescience) Newton's 3 laws of motion (NASA) Voyager 1 & 2 are still voyaging - this is how far they've gone in real time! (JPL, NASA) Outer space has a very low density of particles (Wikipedia) What is a rocket? (NASA) Rockets, fuel & Newton's 3 laws (MIT) The rocket equation (Fourth Millenium Foundation) Kennedy Space Center in Florida is awesome (Kennedy Space Center) Why is it so hard to travel to Mars?…Fuel is a big part of that (space.com) Mars facts (NASA) Mars has a very thin atmosphere (Cool Cosmos, Caltech) George Clooney (Wikipedia) Gravity (IMDb) The Martian (Andy Weir) What are gravity wells? (Explain xkcd) What is gravity assist? (JPL, NASA) Spacetime can bend: Space as a rubber sheet (University of Winnipeg) The Voyagers' trajectory was very carefully planned & used gravity assist to minimise fuel (JPL, NASA) Voyager 1 & 2 were launched in 1977 (JPL, NASA) There are a lot of forces trying to slow us down on Earth (the Physics…