The essential vocabulary pertaining to the solar system, galaxies, and the universe, as well as vocabulary associated with space exploration are covered in this unit. Example: The planets turn on this axis, or ___, as they travel around the sun.As students progress through the 26 exercises featured, they gain practical knowledge about these fields of science. Simultaneously, they become familiar with 75 “space” words by practicing basic skills in reading, comprehension, word definition, spelling, and writing. Reinforcement activities range from writing definitions, matching, completing sentences through context clues, sentence writing, identifying syllables, puzzles, and much more. A separate Space Vocabulary page is included.