By Kevin Manning

Astronomy is the main interesting and enjoyable subject within the universe. in fact, i'm a piece biased, yet don't you settle? utilizing a telescope to determine the invisible and glance some distance again in time, exploring the universe to benefit approximately meteors, the Moon, comets, asteroids, megastar clusters, nebulae and galaxies, and attempting to comprehend the function of black holes, darkish subject, and darkish strength, are all lined during this stress-free textual content.

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Irr A, VIOUR SIMON is the author of over ninety science books for children. His many award-winning books include Hidden Worlds: Pictures of the Invisible (a New York Academy of Science Honor Book and Booklist Reviewer's Choice), Little Giants {Booklist Reviewer's Choice) The Optical Illusion as well as Book and Chip Rogers, Computer Whiz. Saturn is a companion volume to Mr. Simon's Earth: Our Planet in Space and The Moon, an ALA Notable Book. Mr. Simon Hves in Great EARTH: Our Neck, New York.

F wm ><£rf*v. » . \: \ \» f* il^' *~%T t*. «*' wV X J Tethys A wf>: » 4itft W* Rhea Rhea [REE-a] is the second largest of Saturn's moons, about 950 miles across. Like Dione, Rhea is mostly ice and rock. Rhea's surface is heavily cov- ered with craters, the most of any of Saturn's moons. This color picture shows that large parts of Rhea are covered by frost. Titan [TY-tan] is the largest of Saturn's moons, about 3190 miles across. That's bigger than our own moon and bigger even than the planets Mercury and Pluto.

That's bigger than our own moon and bigger even than the planets Mercury and Pluto. m Titan known is the only moon in the Solar to have an atmosphere. System The atmosphere covers Titan with a thick haze that hides its surface. Titan's atmosphere is mostly nitrogen gas with some methane, a poisonous gas. Titan there go is a very, very cold place. Temperatures down to 300 degrees (F) below zero. Sci- entists think that Titan's surface thick layers of methane ice may be covered by and snow. know it could live on Titan.

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