The union of atomic nuclei to form heavier nuclei, resulting in the release of enormous quantities of energy. Fusion occurs when four hydrogen atoms are squeezed together to form two helium atoms. Any of numerous clouds of gas or dust in interstellar space. A nebula is a giant cloud of gas and dust swirling around in space that will pull together, go through a chemical reaction called fusion, and produce the core of a new star. A celestial body orbiting another of larger size.
Planet Earth has one satellite, the moon, revolving around it.
The sun and the group of celestial bodies held by its attraction and revolving around it. The sun, the center of our solar system, has nine planets orbiting it. Vocabulary Quiz Whiz Create a variety of interesting quizzes to test your students' word power. Puzzlemaker Send your students home with word searches, crossword puzzles and more. This tool will help you create unique puzzles using the vocabulary words from this lesson plan.