Nightscapes - Robert Arn
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Discover No More

Featured on NASA's APOD (Astronomy Picture of the Day) March 14th, 2011.

This image marks a time of change for space exploration. We see the Space Shuttle Discovery crossing the night sky (bottom trail) hours after it undocked from the International Space Station (top trail). Less than a day after this image was taken, Discovery landed on Earth and was put into retirement.

Special care has been taken in processing this photo. The field of view is nearly 180 x 90 degrees, or half of the sky which is above the horizon. To give a better perspective, the far left of the image corresponds to the direction NW and the far right of the image is ESE. Discovery and the ISS were only separated (width) by less than 2 degrees. At their highest point, they were 71 and 72 degrees above the horizon. A careful combination of automatic and manually alignment and transformations was needed to project the 3-dimensional environment onto this 2-dimensional image.