Grade 9 Science - Space

12345678910111213141516
Across
  1. 2. a smaller group of stars that is part of a constellation
  2. 4. the force that keeps the planets in orbit
  3. 9. a natural object in space
  4. 11. the path in which the Sun appears to move while looking at the sky from Earth
  5. 13. came up with the geocentric model and describe a 22 sphere system
  6. 15. a model with the Sun at the centre
  7. 16. expanded on Aristotle's findings using mathematics
Down
  1. 1. a group of stars that forms a picture in the sky
  2. 3. the apparent brightness of a star; caused by how close it is to us and how big it is
  3. 5. explained planetary movement using the law of gravity
  4. 6. believed the Sun and moon revolved around the Earth but that the other planets revolved around the Sun
  5. 7. a celestial body made of hot gas
  6. 8. a model with Earth at the centre
  7. 10. used a telescope to observe the phases of Venus and four of Jupiter's moons
  8. 12. came up with the heliocentric model
  9. 14. brahe's assistant; described elliptical orbits