Across
- 4. Reddish in colour, nicknamed the 'red planet'
- 6. Not a planet or comet, but small rocky object
- 8. A 4.5 billion dwarf star, containing hydrogen and helium
- 10. Takes 27 days to orbit, made mostly of rock, with craters
- 11. Small solid chunks of debris
Down
- 1. 71% of the Earth's surface is covered by this
- 2. The outer layer of the Earth
- 3. Earth's inside, made mainly of Iron
- 5. Mostly made of gas, has rings and approximately 9 times wider than Earth
- 7. A place launched in 1988
- 9. Made of frozen water, begins to release gas when close to the sun