Observing the universe

12 questions

1. A ___ star fuses hydrogen in its core. It is stable for long periods of time (often billions of years).
2. What type of star will the Sun change into next, after it stops fusing hydrogen in its core (in about 5 000 000 000 years)?
3. Sort the following stages of a star's life, for a star similar in size to the Sun, into the order in which they take place.
4. What is a giant exploding star called?
5. What is a neutron star that is formed from the core of a supernova?
6. What is a black hole that is formed from the core of a particularly large supernova?
7. Which of the following optical instruments can improve what we can see in space?
8. What makes a star appear to twinkle in the night sky?
9. What are the advantages of using a space telescope compared to a telescope on Earth?
10. How do **Messier objects** that can be seen with a telescope differ in appearance from stars?
11. What are absorption lines in a spectrum of light from a star?
12. What observation shows that **redshift** has occurred and that the wavelength of light from a distance galaxy has increased?

License: OGL