Read the clue. Fill in the crossword puzzle with the correct word. The crossword puzzle will turn green if you are correct! Take a picture of the completed puzzle to show your teacher.
1. Scientist who studies space and the universe
2. Smallest unit of matter; the basic building block of matter
3. A pattern of stars in the sky that people have found to represent people, animals, or objects
4. A group of stars, dust, and gas held together by gravity
5. A force of attraction that causes a heavier object to pull objects toward its center; also called “gravity”
6. A star in its mature phase, giving off huge amounts of energy from nuclear fusion reactions
7. A collection of large amounts of atoms, molecules, and dust
8. An explosive reaction that takes place when two atoms collide and form a new atom, releasing a huge amount of energy
9. The center of the atom that contains the protons and neutrons; plural form is “nuclei”
10. Part of the center of the atom; has a positive charge
11. A rotating disk of dust and gas particles, increasing in size, on its way to becoming a star
12. A massive sphere of plasma, made mostly of helium and hydrogen
13. The most powerful type of explosion in the universe
14. All the matter, space, and energy that exist
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