What is an orbit? How do you reach orbit? How do you change orbits? Mars One Astronaut Candidate Ryan MacDonald explains the basics of orbital mechanics.
- This is what goes on behind the scenes of Kerbal Space Program!
The concepts explored in this video are used in Part 2 - 'Getting to Mars: The Hohmann Transfer': https://www.youtube.com/watch?v=LzsMjEMDpD4 - to plan a mission to Mars.