# Stars and the universe

> Grade 9: the Sun is a star, galaxies and the Milky Way, light years, life cycle of a star, gravity holds planets in orbit.

Source: https://olyclass.com/library/science-g9-universe-stars-en/

- Subject: Science
- Level: Grade 9
- Quiz: 16
- Play it free on one screen (projector, TV or whiteboard): https://olyclass.com/library?play=science-g9-universe-stars-en
- Copy and edit it: https://olyclass.com/library?copy=science-g9-universe-stars-en
- Games it plays well in: [Paper Race](https://olyclass.com/classroom-games/paper-race/), [Three in a Row](https://olyclass.com/classroom-games/three-in-a-row/), [Line of Four](https://olyclass.com/classroom-games/line-of-four/), [Team Bingo](https://olyclass.com/classroom-games/team-bingo/)

## Questions

1. What kind of object is the Sun? (A comet / A moon / A planet / A star)
   Answer: A star
2. The Sun appears much brighter than other stars because it is much closer to Earth.
   Answer: True
3. Which process in the Sun's core releases its energy? (Burning coal / Chemical rusting / Nuclear fission / Nuclear fusion)
   Answer: Nuclear fusion
4. What is a galaxy? (A cloud of gas inside our Solar System / A group of planets around one star / A huge group of stars, gas and dust held together by gravity / A single very large star)
   Answer: A huge group of stars, gas and dust held together by gravity
5. Which galaxy contains our Solar System? (Andromeda / The Milky Way / The Sombrero / The Whirlpool)
   Answer: The Milky Way
6. Roughly how many stars are in the Milky Way?
   Answer: Hundreds of billions
7. What does a light year measure? (Brightness / Distance / Speed / Time)
   Answer: Distance
8. A light year is the distance light travels in one year.
   Answer: True
9. A star is 8 light years away. What do we see when we look at it? (Light that left it 8 years ago / Light that left it 80 years ago / Light that will leave it in 8 years / The star as it is right now)
   Answer: Light that left it 8 years ago
10. Stars form from clouds of gas and dust called what? (Asteroids / Comets / Galaxies / Nebulae)
   Answer: Nebulae
11. What will the Sun become after it stops being a main sequence star and swells up? (A black hole / A comet / A red giant / A supernova)
   Answer: A red giant
12. What is the huge explosion at the end of a massive star's life called?
   Answer: A supernova
13. The Sun will turn into a black hole when it dies.
   Answer: False
14. Which force keeps the planets in orbit around the Sun? (Air resistance / Friction / Gravity / Magnetism)
   Answer: Gravity
15. What is the name for the curved path a planet takes around the Sun?
   Answer: An orbit
16. If a planet were moved farther from the Sun, the Sun's pull on it would be... (Stronger / The same / Weaker / Zero)
   Answer: Weaker