Across
- 1. Planets- Rocky surfaces, few/no moons, no rings.
- 5. Planets- Objects that meet the first two criteria.
- 7. Planets- Mercury, Venus, Earth, and Mars; rocky and small.
- 9. holes- Regions of spacetime with gravity so strong not even light can escape.
- 10. Massive systems containing billions of stars, gas, dust, and dark matter bound by gravity.
- 12. a yellow dwarf star located at the center of our solar system.
- 13. Natural satellites orbiting planets
- 14. a massive, luminous sphere of plasma
Down
- 2. Giants- Formed when Sun-like stars expand at the end of their lives.
- 3. a celestial body that orbits a star
- 4. These are planets that orbit stars other than our Sun.
- 6. three-dimensional expanse that exists beyond Earth's atmosphere
- 8. Planets- Some planets do not orbit a star at all and instead "wander" through interstellar space.
- 10. Giants: Jupiter, Saturn, Uranus, and Neptune; large planets composed mainly of hydrogen, helium, and ice.
- 11. Planets- Rocky surfaces, few/no moons, no rings.