Across
- 2. A celestial body that generates energy and light, held together by its own gravity
- 4. A system of planets and other bodies orbiting a star
- 5. A low mass star that expands when it runs out of hydrogen
- 8. A place in space where gravity is so strong that even light cannot escape
- 9. A streak of light produced when a meteoroid enters Earth’s atmosphere and heats up
Down
- 1. A large, roughly spherical body that orbits a star and does not produce its own light
- 3. A star compressed so the electrons fuse with protons in the nuclei of atoms
- 4. A sudden violent expansion of a star
- 6. A cloud of dust and gas
- 7. A system of millions of stars, gas and dust held together by gravity