$ 2 9 5] New Satellites 381 



Observatory, an eighth satellite of Saturn, called Hyperion, 

 which was detected independently by Lassell two days 

 afterwards. In the following year Bond discovered that 

 Saturn was accompanied by a third comparatively dark ring 

 now commonly known as the crape ring lying imme- 

 diately inside -the bright rings (see fig. 95); and the 

 discovery was made independently a fortnight later by 



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DE1MOS 







FIG. 92. Mars and its satellites. 



William Rutter Dawes (1799-1868) in England. Lassell 

 discovered in 1851 two new satellites of Uranus, making 

 a total of four belonging to that planet. The next dis- 

 coveries were those of two satellites of Mars, known as 

 Deimos and Phobos, by Professor Asaph Hall of Washington 

 on August nth and lyth, 1877. These are remarkable 

 chiefly for their close proximity to Mars and their extremely 

 rapid motion, the nearer one revolving more rapidly than 



