Solar system

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Across
  1. 2. rocks that fall into earth and burn up
  2. 6. a giant spherical shell surrounding our solar system
  3. 7. an object that orbits a planet or something else that is not a star
  4. 8. Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ices.
Down
  1. 1. rocky, airless remnants left over from the early formation of our solar system
  2. 3. a 4.5 billion-year-old yellow dwarf star – a hot glowing ball of hydrogen and helium
  3. 4. Meteoroids are space rocks that range in size from dust grains to small asteroids.
  4. 5. A planet is a celestial body that is in orbit around a star