Across
- 4. The lens at the end of a refracting telescope that collects and focuses light to form an image.
- 7. The apparent movement of stars when observed at different times of the year.
- 9. Commonly used to measure distances in space. (5,4)
- 11. Type of star with an absolute magnitude +10 to +16 and temperature >4400 degrees celcius. (5,5)
- 12. Rings of gas and dust orbiting stars may condense to form what?
- 14. What can be used to identify the elements in stars.(9,8)
- 17. Another word for brightness.
- 19. Lipperhey developed what type of telescope?
- 21. When a star runs out of energy and collapses, the rebounding material forms a massive explosion called.
- 23. Force that pulls matter closer together.
Down
- 1. Another word for moon.
- 2. The lens that magnifies an image. (3,5)
- 3. A giant cloud of gas and dust in space where stars form.
- 5. Common issue of refracting telescopes, solved by using reflection.(9,10))
- 6. Dense remnant of star that can only be seen as an absence of light.
- 8. The model of the solar system with the Sun at its center.
- 10. A theory of how the universe started.
- 13. A type of electromagentic wave that is emitted by our Sun.
- 15. Rapidly spinning neutron star.
- 16. Evidence that galaxies are moving away from our own.
- 18. The model of the solar system with the Earth at its center.
- 20. Process by which Hydrogen becomes Helium.
- 22. What existed before the Big Bang?