Dark energy

High school (ages 12+)
Space & Astronomy

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/dark-energy

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the dominant cosmic component?Constitutes approximately 68% of the universe's total energy density
2. What is the primary observational evidence?Accelerating expansion of the universe, detected via Type Ia supernovae
3. Why does the universe expand faster?Scientists see that galaxies are moving away from each other at an ever‑increasing speed, which means something is pushing them apart instead of slowing them down.
4. How do scientists know about dark energy?By studying bright exploding stars called Type Ia supernovae, astronomers measured how far they are and found they are farther than expected, showing the universe is speeding up.

Physical Cosmology: The scientific study of the origin, evolution, and large-scale structure of the universe.
Baryonic Matter: Ordinary matter composed of protons and neutrons, making up stars, planets, and ourselves.
Lambda-CDM Model: The standard model of cosmology, describing the universe's composition and evolution.
Type Ia Supernova: A specific type of stellar explosion used as a standard candle for measuring cosmic distances.