AweSky is your free astrophotography gallery Widefield > Landmarks > The night skies at Lassen Volcanic National Park
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The night skies at over 8000 feet up in Lassen Volcanic National Park are amazing. This is a single 10 minute exposure showing the star trails around the north celestial pole as the Earth spins on its axis under the stars. The mountain in the middle is Lassen Peak a lava dome or plug dome volcano that is considered to be one of the largest if not the largest of its type in the world. The green glow of the sky is known as Air glow and is a result of ionized gases giving off light in the upper atmosphere just like aurora but with a chemical cause of the ionization rather than high energy particles from the sun in the case of aurora. As a result a long exposure photo will often show this airglow.
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