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Across 1. has atmosphere of oxygen and hydrogen 4. what keeps us grounded on earth 5. what replaces the sun at night 6. chunks of dirty ice from the formation of the solar system 9. a bunch of asteroids in-between mars and jupiter 10. the largest planet in our solar system 12. known as earths sister planet 13. massive

Down 2. rocky remains from the formation of the solar system 3. floating objects in space that collect scientific information 7. the name of the solar system we live in 8. the centre piece of the solar system 11. a planet recently changed to a dwarf planet