http://apod.nasa.gov/apod/ap100311.html
Yukon Aurora with Star Trails
In this picture we see two interesting things. First we see stars that seem to be shown in a time laps and appear to be circling a center spot. The next thing that you can see is the green lights. This camera was fixed to a tripod to prevent shaking. The stars look like they are going around a circle because the earth rotates on its axis and because we are near the north we can see where the axes is. The green lights are caused by the high latitudes during March and April. These lights are called aurora lights. This picture is very interesting and amusing because it shows the beauty of nature and science and it is amazing how we can learn more about the earth's rotation by taking a picture.
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