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Sky & Telescope's Mars PuzzleFormat: Puzzle This beautiful circular jigsaw puzzle is 18 inches (46 cm) in diameter. Viking 1 Orbiter imagery of the Red Planet provides a vivid picture thats affixed to a strong cardboard backing and then die cut to produce the 350 puzzle pieces. The finished product can be coated with puzzle glue, framed, and displayed. Warning: Not suitable for children younger than 3 years. The puzzles small pieces may pose a possible choking hazard. Size:

By Wil Tirion and Brian Skiff

as well as the proper use and construction of the merit function

residual longitudinal color (its dominant defect) cannot be reduced to an optically harmless value

there are ways to check the accuracy of individual components but for many they are hard to understand or require costly reference optics and other test equipment

For a variety of reasons the trend in telescope construction today is toward much faster

Cetus leads us into a large extragalactic realm where we find the nearby dwarf irregular IC 1613

orientation

Sky & Telescope Contributing Editor

30mm cube beam splitter $39

and John Herschel

Constellation Summary Table (Name

and the stunning Omega Centauri globular cluster (NGC 5139)

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