CK-12-Physics - Intermediate

http://www.ck12.org Chapter 9. Newton’s Universal Law of Gravity

9.4 References

1. Courtesy of NASA. http://commons.wikimedia.org/wiki/File:Solar_system.jpg. Public Domain
   2.. http://commons.wikimedia.org/wiki/File:Johannes_Kepler_1610.jpg. Public Domain


2. Eduard Ender. http://commons.wikimedia.org/wiki/File:Tycho_Brahe.JPG. Public Domain


3. Raymond Chou. CK-12 Foundation. CC-BY-NC-SA 3.0


4. Raymond Chou. CK-12 Foundation.


5. Sir Godfrey Kneller. http://commons.wikimedia.org/wiki/File:GodfreyKneller-IsaacNewton-1689.jpg.


6. Raymond Chou. CK-12 Foundation. CC-BY-NC-SA 3.0


7. Laura Guerin and Raymond Chou. CK-12 Foundation.


8. Laura Guerin and Raymond Chou. CK-12 Foundation.
   10.. http://commons.wikimedia.org/wiki/File:Charles_de_coulomb.jpg.


9. Joy Sheng, using image courtesy of NASA. CK-12 Foundation (Earth image from http://commons.wikimedia.
   org/wiki/File:Nasa earth.jpg).


10. Courtesy of NASA Goddard Space Flight Center. http://www.flickr.com/photos/gsfc/7630269434/. CC BY
    2.0


11. Laura Guerin and Raymond Chou. CK-12 Foundation.