Across
- 2. the Greeks used the star chart for it
- 4. Ptolemy's occupation
- 6. space telescope
- 9. there are three (Kepler's)
- 10. The first planet from the Sun
- 11. most scientists think of the universe is
Down
- 1. the distance that light travels in a vacuum in one year
- 3. this 'way' is our galaxy
- 5. period when people returned to scientific values
- 6. a model of zhe solar system
- 7. orbit around the sun
- 8. it takes about 76 years to complete the orbit. (Halley)