Mini-Quiz: Galaxies

1. What are many of the stars in a galaxy?

   PlanetsSorry, not correct. Try another button. There are no stars in a galaxyGood try, but not right. Select another answer. Planetary systemsThat is correct. You are becoming an astronomical Champion.

2. Why do they call it "dark matter"?

   Because it is a dark brown colorSorry, not correct. Try another button. Because it is very heavyOops! Wrong answer. Re-read the question and try again. Because no one has seen itCorrect. Great job!

3. What is a light year?

   How long the light shines each yearGood try, but not right. Select another answer. The distance light travels in a yearThat is correct. You are becoming an astronomical Champion. 125 billionSorry, not correct. Try another button.

Pick an answer to see instant feedback. Re-read the lesson if you miss one.