- What is our universe made up of?
- Do you know what dark matter or dark energy are? Can you make some guesses about what they might be?
- What is gravity?
- What is “star stuff”? Name a few examples of star stuff.
- What does the “dark” in dark matter and dark energy refer to?
- What is the majority of our universe made up of: dark energy, dark matter, or star stuff? How much of our universe is made up of star stuff?
- Did Fritz Zwicky discover that dark matter increased or decreased a galaxy cluster’s total mass?
- Do scientists think dark matter particles are very small or very large?
- Name two differences between star stuff and dark matter particles.
- Name one kind of particle that is a strong candidate for dark matter.
- Name one big way in which dark matter and dark energy are different from each other.
- What kind of cosmic event helped scientists discover dark energy?
- Is our universe expanding or shrinking? Is the universe expanding at a rate that is accelerating or decreasing?
- What force of nature led scientists to discover dark matter? (Hint: It’s the same force of nature that keeps you on the ground.)
- How do scientists know that dark matter and dark energy exist? What kinds of clues to the existence of dark matter and dark energy have researchers found?
- In what ways are scientists “looking” for dark matter? How are scientists “looking” for dark energy?
- Can you think of other things that humans can’t see but know exist?
- Is it important to study things that are invisible? What can invisible things tell us about our world and ourselves?