Image Sources
(1) NASA.http://en.wikipedia.org/wiki/Image:Moon_PIA00302.jpg. Public
Domain.(2) http://upload.wikimedia.org/wikipedia/commons/c/c4/Planets2008.jpg.
Public Domain.(3) The Formation of a Lunar Eclipse.. Public Domain.(4) The Earth tilts on its axis.. CC-BY.(5) NASA. A crater on the surface of the Moon.. Public Domain.(6) CK-12 Foundation.. CC-BY-SA.(7) NASA. The far side of the Moon.. Public Domain.(8) http://en.wikipedia.org/wiki/Image:Solarsys.svg. GNU-FDL.(9) The Sun.. GNU-FDL.(10) The layers of the Sun.. GNU-FDL.
(11) http://commons.wikimedia.org/wiki/File:Kompas_Sofia.JPG. GNU-FDL.
(12) http://en.wikipedia.org/wiki/Image:Clementine_albedo_simp750.jpg.
GNU-FDL.
(13) Nicholas Copernicus.. Public Domain.
(14) http://en.wikipedia.org/wiki/File:
Foucault_pendulum_at_north_pole_accurate.PNG. GNU-FDL.
(15) NASA.http://commons.wikimedia.org/wiki/File:The_Blue_Marble.jpg. Public
Domain.
(16) NASA.
http://commons.wikimedia.org/wiki/Image:Magnetosphere_rendition.jpg.
Public Domain.
(17) NASA.http://en.wikipedia.org/wiki/File:Aldrin_near_Module_leg.jpg.
Public Domain.
(18) CK-12 Foundation. Sunspots.. Public Domain.
(19) tilt.jpg. GNU-FDL.