Acceptable Reference Sources Include

TOPIC: Light, Astronomical Observations and the SunIn your discussion post you must provide a brief summary of your findings (conclusions and supporting research such as data collection or analytical methods used) on the discussion board.

ACCEPTABLE Reference Sources include scientific journals (Nature, Science, Geology etc…) or scientific magazines (Scientific American, Astronomy, Science News, LiveScience, ScienceDaily, Newscientist etc…). Nature and Scientific American are two of the best sites to use.
DO NOT USE newspaper or television news sites (ABC, BBC, CNN, The Guardian, NY Times, Huffington Post, USA Today etc….), blogs, textbooks, encyclopedias, .org websites, Wikipedia or any non-science type publications.