Across
- 4. The name of our galaxy.
- 5. System of stars, stellar remnants, gas, dust, and dark matter.
- 7. Classification of the planets can be divided into _______ _______ and ice giants.
- 9. Luminous spheroid of plasma held together by its own gravity with an hydrogen core.
- 10. Planet with the most known moons (79 confirmed), including Europa.
Down
- 1. Most accepted theory about the origin of the universe, developed by George Lamaître.
- 2. Known as the red planet, it's the fourth one from the sun.
- 3. Region with such a gravitational pull that nothing can get out of it.
- 6. Planet with a prominent ring system composed mostly of ice particles.
- 8. It's considered to be Earth's twin because their composition is too similar.