Free Printable Sun Coloring Page. Free Printable Coloring Page about The Sun the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as visible light and infrared radiation. It is by far the most important source of energy for life on Earth. The Sun is travelling at 220 km per second. Click on the link to download or print the Sun Coloring page free in PDF format.
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