Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. The aurora, also known as the northern and southern lights , appear as luminous bands or streamers of light which can extend to altitudes of 200 miles. They are typically visible from the Earth's surface at high latitudes and are caused by high energy particles from the Sun . The delicate colors are caused by energetic electrons colliding with oxygen and nitrogen in the atmosphere. In this picture , the rear structure of the Space Shuttle is visible in the foreground with the vertical tail fin pointed toward Earth.
Star trails are visible as small streaks above Earth's horizon.
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