JERRY LODRIGUSS / SCIENCE PHOTO LIBRARY JERRY LODRIGUSS / SCIENCE PHOTO LIBRARY
Pleiades and Hyades star clusters. These two open star clusters (Hyades, left; Pleiades, right) are among the most visible in the sky, and are found in the constellation of Taurus. The brightest of the Hyades stars (orange) form a V-shape, with the brightest star (Aldebaran) at upper left of this V-shape, though Aldebaran is a foreground star. The Hyades is the closest star cluster (150 light years) and the Pleiades (380 light years) is also close. Open (or galactic) cluster stars form near each other and then drift apart. The Hyades (790 million years old) have drifted further apart than the Pleiades (100 million years old), and the blue colour of the Pleiades marks them as young stars.
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