http://en.wikipedia.org/wiki/Sub-orbital_spaceflight Figure 7-4 NASA illustration by Robert Simmon http://earthobservatory.nasa.gov/Features/OrbitsCatalog/images/orb ital_inclination.png
http://en.wikipedia.org/wiki/Ansari_X_Prize http://en.wikipedia.org/wiki/Retrograde_and_prograde_motion
Figure 7-5 "Comparison satellite navigation orbits" by Cmglee, Geo Swan - Own work, Earth bitmap is File:North_pole_february_ice-pack_1978-2002.png by Geo Swan.. Licensed under CC BY-SA 3.0 via Wikimedia Commons http://commons.wikimedia.org/wiki/File:Comparison_satellite_navi gation_orbits.svg
http://en.wikipedia.org/wiki/Orbital_inclination http://en.wikipedia.org/wiki/Ground_track http://fas.org/spp/military/docops/army/ref_text/chap5im.htm http://science.nasa.gov/science-news/science-at-nasa/2000/ast01dec _1/
Figure 7-6 USGS http://earthshots.usgs.gov/earthshots/sites/all/files/earthshots/earth shot/about/satellite-orbit.jpg
http://www.au.af.mil/au/awc/space/primer/ Figures 7-7 & 7-8 US Air Force, Air University, Space Primer, Chapter 8 http://www.au.af.mil/au/awc/space/primer/
http://history.nasa.gov/shuttleoverview1988/part1.htm http://en.wikipedia.org/wiki/Orbital_maneuver
Figure 7-9 http://science.nasa.gov/media/medialibrary/1999/04/07/ast06may9 9_1_resources/StationCoverage1.gif
http://en.wikipedia.org/wiki/Orbital_inclination_change http://en.wikipedia.org/wiki/Space_rendezvous
Figure 7-10 US Air Force, Air University, Space Primer, Chapter 8 http://www.au.af.mil/au/awc/space/primer/
http://www.orbiterwiki.org/wiki/GPIS_5:%20Dancing%20In%20The %20Dark
Figure 7-11 Adapted from NASA http://history.nasa.gov/shuttleoverview1988/p3.jpg
http://en.wikipedia.org/wiki/Automated_Transfer_Vehicle Figure 7-12 Adapted from NASA http://history.nasa.gov/afj/pics/lor2.gif
http://www.esa.int/Education/Space_In_Bytes/ATV_a_very_special _delivery_-_Lesson_notes
Figure 7-13 "Phase Shuttle" by Esburgos - Own work. Licensed under CC BY-SA 4.0 via Wikimedia Commons http://commons.wikimedia.org/wiki/File:Phase_Shuttle.jpg
http://en.wikipedia.org/wiki/Exploration_of_Mars http://www2.jpl.nasa.gov/basics/bsf4-1.php
Figure 7-14 Adapted from NASA http://spaceflight.nasa.gov/gallery/images/shuttle/sts-124/hires/s12 4e009982.jpg
http://en.wikipedia.org/wiki/Gravity_assist http://en.wikipedia.org/wiki/Gravity_turn
Figure 7-15 http://www2.jpl.nasa.gov/basics/launch_still.gif
http://en.wikipedia.org/wiki/Free_return_trajectory http://en.wikipedia.org/wiki/Nuclear_pulse_propulsion
Figure 7-16 http://upload.wikimedia.org/wikipedia/commons/thumb/7/70/Orbit al_Hohmann_Transfer.svg/1024px-Orbital_Hohmann_Transfer.svg. png?1430838853406
Images
Figure 7-17 "Hohmann transfer orbit" by Leafnode - Own work based on image by Hubert Bartkowiak. Licensed under CC BY-SA 2.5 via Wikimedia Commons http://commons.wikimedia.org/wiki/File:Hohmann_transfer_orbit.s vg
Chapter Cover ESA/NASA https://www.nasa.gov/sites/default/files/chmielewski-3_0.jpg Figure 7-1 "SatelliteCentripetalForce" by Jfmelero - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons http://commons.wikimedia.org/wiki/File:SatelliteCentripetalForce.sv g
Figure 7-18 http://mars.nasa.gov/mer/technology/bb_propulsion-01.html Figure 7-19 "Gravity assist still Jupiter". Licensed under CC BY-SA 3.0 via Wikimedia Commons http://commons.wikimedia.org/wiki/File:Gravity_assist_still_Jupite r.svg
Figure 7-2 Adapted from "Flightpath02" by copenhagensuborbitals http://www.copenhagensuborbitals.com/press.php - free press pictures. Licensed under CC BY-SA 3.0 via Wikimedia Commons http://commons.wikimedia.org/wiki/File:Flightpath02.jpg Figure 7-3 Adapted from ESA http://blogs.esa.int/rocketscience/files/2015/02/IXV_flight_profile.p ng
Figure 7-20 "Gravity assist moving Jupiter". Licensed under CC BY-SA 3.0 via Wikimedia Commons http://commons.wikimedia.org/wiki/File:Gravity_assist_moving_Ju piter.svg
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