The Solar System

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