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Arches National Park Geology Tour provides an extensive, visually rich description of the geology of Arches, by Deborah Ragland, Ph.D. See our DVD collection.
Stars change position over time. In these two pictures, the double star, 61 Cygni, moved compared to the stars in the background.

61 Cygni A & B

What's in a Name: Double Star designated 61 in Cygnus the Swan
Claim to Fame: Some of the closest stars to the sun(13th closest). Moving very rapidly through space as seen from Earth at a rate of ~45,000 miles per hour (72,000 km/hr)
Type of Star: Orange-red Main Sequence (Spectral Class K3.5 and K4)
How Far Away: 11.3 light years
How Big: 1/2 and 2.4 times the sun's radius
How Bright: 1/12 and 1/26 of the sun's visible brightness
Where to View: Barely visible to the unaided eye on a dark, moonless night. Located in Cygnus the Swan, also called the Northern Cross (Star Map).
When to View: June through November from northern middle latitudes.

Last modified February 24, 2005 by Travis Metcalfe.

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The Summer 2010 issue of The Earth Scientist, available in our online store, includes articles on rivers and snow, classroom planetariums, satellites and oceanography, hands-on astronomy, and global warming.

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