These mysterious electric blue clouds started showing up in the US summer in Canada and northern parts of Europe. Scientists still don't know how they form.They are 45 and 54 miles (75 and 90 kilometers high but if you are in the right high latitude area, they supposedly easy to see.
This year they are now being observed in Vermont, Wyoming and Michigan. Be on the look out for them and post if you see them.
http://www.spaceweather.com/
more information
http://www.answers.com/topic/noctilucent-cloud?cat=technology
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