Solar System Inventory

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Across
  1. 3. The ___ of the Sun has an average temperature of 29,000,000 degrees Fahrenheit
  2. 5. A unit of measure that when multiplied by 1,392,082.56 is the diameter of the Sun
  3. 6. There are ___ of these planets, and they all have hard surfaces.
  4. 7. A 4.5 billion-year-old yellow dwarf star
  5. 9. The planet ___ is the closest to the Sun of these 4, and Mars is the farthest.
Down
  1. 1. The element that the Sun fuses into helium
  2. 2. This is the acronym that stands for the four planets that have an average diameter of 9129 km.
  3. 4. A system of rotating objects like planets, with the Sun in the middle
  4. 8. There core's are made mostly of ___ and nickel.