Geometric albedo

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/geometric-albedo

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 observational requirement?Requires measurement at or extrapolation to zero phase angle (opposition)
2. Why is the zero phase angle important for measuring geometric albedo?Zero phase angle means the light source, the object, and the observer are lined up, so the object looks brightest from that direction. This special view lets scientists calculate the geometric albedo accurately.
3. How do scientists measure a space rock’s geometric albedo?They watch how bright the object is at many different angles between the Sun, the object, and the observer. By drawing a curve of brightness versus angle, they can estimate how bright it would be at zero phase angle.

Isotropic Scattering: Radiation that is reflected or emitted equally in all directions, regardless of the incident direction.
Phase Function: A function describing how the brightness of an object changes as a function of the phase angle.
Photometry: The scientific study of the measurement of the intensity of light, especially as a function of wavelength.