82.1 MB (82.0 MB compressed)
5088 x 5638 pixels
43.2 x 47.8 cm ⏐ 17.0 x 18.8 in (300dpi)
NATIONAL OPTICAL ASTRONOMY OBSERVATORIES / SCIENCE PHOTO LIBRARY NATIONAL OPTICAL ASTRONOMY OBSERVATORIES / SCIENCE PHOTO LIBRARY
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Star cluster M103. Optical image of the open star cluster M103. The cluster is 14 light years across and lies around 8000 light years from Earth in the constellation Cassiopeia. It contains a red giant star (orange). M103 is thought to be around 20 million years old.
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