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Here's a little opener on the topic of Astronomy. Being a much more intuitive way of grasping the things that happen to us in our own universe, our own planet, distances in the universe and some basic and useful arguments that are very intuitive and very powerful against ignorance and closed-minded arguments. Links for the lecture: The Electromagnetic Spectrum: http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum .html Pictures of the Sun (shrink/grow): http://solar.physics.montana.edu/YPOP/Classroom/Lessons/Ecce ntricity/sunpix.html Definition of a planet (from the International Astronomical Union): http://www.iau.org/iau0603.414.0.html The story behind Pluto's reconsideration as a planet: http://www.astronomy.com/asy/default.aspx?c=a&id=4459 Measuring the distance to the sun (Defining Astronomical Units): http://zebu.uoregon.edu/~soper/Sun/distance.html http://www.badastronomy.com/mad/1996/au.html Measuring Speed of Light: http://galileoandeinstein.physics.virginia.edu/lectures/sped lite.html Nice Speed/Distance Space calculator: http://janus.astro.umd.edu/astro/distance/ Please send me your notes; i am only human, and if I am inaccurate about something, I want to know about it so I can correct myself. Don't hesitate to correct me on anything scientific. Enjoy, ~moo