Quasar

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/quasar

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 power source?Accretion of matter onto a supermassive black hole
2. What is the peak epoch of activity?Approximately 10 billion years ago
3. Why did early astronomers think quasars were stars?Early telescopes saw quasars as point‑like, star‑like spots that also sent strong radio waves, so they were called quasi‑stellar radio sources.
4. How do quasars produce so much energy?Gas and dust fall into a supermassive black hole, forming a hot accretion disk that glows across the whole electromagnetic spectrum. Sometimes powerful jets shoot out plasma, adding to the brightness.

Active Galactic Nucleus (AGN): A compact region at the center of a galaxy with a luminosity far exceeding that of its host galaxy's stars.
Accretion Disk: A structure formed by diffuse material in orbital motion around a massive central body, such as a star or black hole.
Redshift: The stretching of light waves towards longer, redder wavelengths, indicating that an object is moving away from the observer.