Across
- 4. what many stars expand into when they run out of hydrogen to fuse into helium
- 5. a celestial object, thought to be a rapidly rotating neutron star, that emits regular pulses of radio waves and other electromagnetic radiation at rates of up to one thousand pulses per second
- 7. the intrinsic brightness of a celestial object
- 8. a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures
- 10. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
- 11. a star that shows a sudden large increase in brightness and then slowly returns to its original state over a few months
- 12. when a celestial body passes directly between a larger body, like a star, and the observer
- 14. an optical instrument designed to make distant objects appear nearer
- 15. a telescope in which a mirror is used to collect and focus light
- 17. a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass
- 18. the science class you should consider recommending to all your friends
- 19. the name of the space telescope mission that has found most of the planets using the transit method
Down
- 1. A celestial object consisting of an extremely dense mass of neutrons, formed at the core of a supernova
- 2. a series of star types to which most stars belong
- 3. a telescope which uses a converging lens to collect light
- 5. a ball of matter that is contracting to become a star
- 6. a type of telescope that uses light outside the visible spectrum to find cooler stars or those that are hidden by dust clouds
- 9. the degree of brightness of a star as it appears to us
- 13. the study of the interaction between matter and electromagnetic radiation
- 16. a region of space having a gravitational field so intense that no matter or radiation can escape