Want to learn a few things about our solar system? How about this: Venus is twice as far from the sun as Mercury, and yet, because of its thick atmosphere it is almost as hot. Or did you know that Saturn has 22 moons, and the one among them called Titan has an atmosphere that may support some life forms? If it's stars that interest you, did you know that the galaxy called the Milky Way is 100,000 light-years in diameter, and that most of its stars are billions of years old? In this revised and expanded version of A Book About Planets, author Betty Polisar Reigot offers up a comprehensive introduction to astronomy and the nine planets that comprise our solar system. From Mercury to Pluto, the planets are detailed in size and distance from the sun, and readers can compare the amount of days or years each takes to complete their solar orbit. Charts and colorful photographs, actually taken from NASA space probes, help steer readers through the Big Bang and the birth of stars. From black holes to supernovas, there are enough facts here to make an astronomer out of even the youngest of curious minds.