Introduction to The Solar System Crossword Puzzle 1

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Across
  1. 1. A planet must …………… the Sun
  2. 3. A …………………… planet has a size between that of a planet and an asteroid.
  3. 5. A gas …………… planets almost all composed of hydrogen and helium gas, with no solid surface. There may be a molten rocky core.
  4. 9. The Sun has huge …………………………… force, which attracts all the planets.
  5. 10. ………………… giant planets contain more than just hydrogen and helium, with some "ices"; such as water, methane and ammonia.
  6. 11. A planet must be big enough to be nearly ………………………………...
Down
  1. 2. ………………………… planets are primarily made of rock and metal.
  2. 4. ……………………… are minor planets that are in the inner Solar System.
  3. 6. Most of the planets have natural ……………………… (or moons).
  4. 7. The …………… is at the centre of our Solar System.
  5. 8. The Sun is made up only of gas! This gas is extremely hot and is called …………………………….