Ultra diffuse galaxy

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/ultra-diffuse-galaxy

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 galaxy type?Ultra diffuse galaxy (UDG)
2. Why are ultra diffuse galaxies so faint?They are faint because their stars are spread out over a large area, making the light from each star very weak. The surface brightness is much lower than that of normal dwarf galaxies, so they are hard to spot.
3. How do scientists find ultra diffuse galaxies?Scientists use deep imaging surveys, like the Sloan Digital Sky Survey, to look for very faint, spread-out light. They carefully analyze images to separate the galaxies from background noise and other effects.

Surface Brightness: A measure of the apparent brightness of an astronomical object per unit solid angle, crucial for characterizing diffuse objects.
Effective Radius: The radius within which half of the galaxy's total light is emitted, indicating its spatial extent.
Lambda-CDM Model: The standard cosmological model that describes the universe as composed of cold dark matter and dark energy.