Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. On arrival Cassini will begin an ambitious mission of exploration which will include parachuting a probe to the surface of Titan , Saturn's largest moon . Before the development of the telescope , the gas giant Saturn was the most distant planet known to astronomers . Ten times farther from the Sun it receives only 1 percent of the sunlight that Earth does.
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