History of Astronomy Part 1

Edit Answers
12345678910
Across
  1. 3. Circular orbits of planets didn't fit with what we observed in the sky, so Ptolemy suggested the planets also moved in their own ________ while they orbited the Earth.
  2. 4. The study of objects beyond Earth's atmosphere.
  3. 7. Tycho Brache's biggest contribution to astronomy was to take decades of accurate ___________________.
  4. 8. In 1572, people thought there was a new star in the sky, but Tycho Brache proved that it was a star that had exploded. We call this a _______________.
  5. 9. Copernicus proposed a ___________ model of the universe where the planets orbit the Sun.
Down
  1. 1. For a long time astronomers, including Ptolemy and Copernicus believed that the orbits of planets were __________.
  2. 2. The ____________ model is the model of the universe where the Earth is at the centre.
  3. 5. The astronomer Copernicus made the revolutionary suggestion that the planets orbited the ________.
  4. 6. The _________ method is the process used for testing ideas and theories in science
  5. 10. The astronomer Ptolemy belived that all the planets and stars orbited the _______.