1. Stars, Suns, and Moons

2. A spherical object in space made up of Hydrogen, Helium (or other gases), and that gives off its own light is called a A: moon B: planet C: star D: asteroid

3. A natural satellite of a planet is called a A: star B: asteroid C: sun D: moon

4. What makes our planet Earth unique for supporting life? A: specific atmosphere B: distance from the sun C: rotation and tilt that allows for seasons D: all of the above

5. A collection of stars that influence each other because of their gravity is called a A: star cluster B: galaxy C: nebula D: solar system

6. Polaris, our north star, is unique and useful in astronomy and navigation because A: it is the only stationary star in our universe relative to Earth B: it is not stationary relative to Earth C: it is directly North of Earth D: it appears only in winter

7. An astronomical unit (AU) is approximately 150 million km. Why do scientists use this measurement in astronomy? A: it is the diameter of Earth B: it is the approximate average distance between Earth and our sun C: it is the distance between Earth and our moon D: it represents a random unit that scientists use to define an AU

8. A group or pattern of stars as observed from Earth is called a A: system B: galaxy C: constellation D: nebula

9. Why do stars have different colors? A: they differ in size, temperature, and age B: they are made of crystals that reflect light differently C: they reflect different suns D: they act as lenses for refracted light

10. How large is our sun? A: 1.4 million km in diameter B: 100 billion km in diameter C: 10 km in diameter D: 1 km in diameter

11. Our solar system is approximately twice the distance of our planet Pluto to the sun across or A: 80 AUs B: 1 AU C: 50 light years D: 1 light year