Magnitude (astronomy)

High school (ages 12+)
Space & Astronomy

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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/magnitude-astronomy

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 magnitude scale ratio?A difference of 5 magnitudes corresponds to a brightness ratio of 100:1
2. What is the apparent magnitude determinants?Apparent magnitude is a function of intrinsic luminosity, distance, and interstellar extinction
3. What does the word "magnitude" mean in astronomy?Magnitude is a number that tells how bright a star or planet looks from Earth. The smaller the number, the brighter it is, and a difference of five magnitudes means one object is 100 times brighter.
4. Why do astronomers use a logarithmic scale for magnitude?Because stars and planets can be extremely bright or very dim, and a logarithmic scale lets us compare all of them with manageable numbers. Each step in the scale is about 2.5 times brighter or dimmer.

Logarithmic Scale: A scale where intervals represent multiplicative factors rather than additive units, used for vast ranges of values.
Interstellar Extinction: The dimming and reddening of light from distant stars caused by absorption and scattering by interstellar dust.
Astronomical Unit (AU): The average distance between the Earth and the Sun, approximately 150 million kilometers.