
Space is the near-emptiness in which all objects in the universe move. The planets and the stars are tiny dots compared with the vast expanse of space. World Book online.
This Lib Guide explores space in broad terms; from living in space to space stations and examing the relationships between the moon, earth and sun. Click on the image to view an article on space from World Book online.
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Planet is a large, round body that orbits a star and shines by the reflection of the star’s light. The International Astronomical Union (IAU), an organization of astronomers, recognizes eight planets that orbit the sun in our solar system. In order of increasing distance from the sun, they are (1) Mercury, (2) Venus, (3) Earth, (4) Mars, (5) Jupiter, (6) Saturn, (7) Uranus, and (8) Neptune. The IAU recognizes many smaller objects that also orbit the sun, with some, such as Pluto and Ceres, designated as dwarf planets. In addition, astronomers have discovered thousands of extrasolar planets (or exoplanets)—that is, planets that orbit other stars.