The aurora borealis is usually green in color, although it can also appear to be a range of other colors, including red, blue, pink and purple. The color of the aurora is determined by the altitude in which it appears. Different atmosphere compounds (such as Nitrogen and Oxygen) are found at different altitudes. When charged particles from the Sun enter our atmosphere, they interact with those compounds, and the aurora is the visible result. Depending on which compounds are being excited by the

388 reactions · 97 shares | AURORA CHANGE MAKER: Congratulations to Aurora’s own, David Smith, on being named a CBS Chicago Change Maker! The founder and CEO of AT RISK Mentoring is changing the lives of our youth and their families. David sat down on set with CBS Chicago Morning News Anchor Ryan Baker to talk more about the new community center in Hometown. Congratulations, David! You make us Aurora Proud! www.atriskmentoring.com | City of Aurora, IL, Government | Facebook

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