đ In our investigation, weâll be measuring distance in light-years. From our last lesson, what is a light year?
When people look at Pegasus (PEG-uh-sus), they usually notice four stars that make a large square shape. This is called the Great Square of Pegasus. Pegasus is named after a famous animal from Greek mythology, a magical flying horse. In North America, we see Pegasus in the fall, in September it is high in the sky.
Names of the four stars in the great square of Pegasus:
Alpheratz (AL-fer-rats)
Beta Pegasi (BAY-tuh PEG-a-see)
Algenib (al-JEN-nib)
Markab (MAR-kab)
Directions: Finding Distances of Stars from Earth:
Login to the Sim, Patterns of Earth and Sky by clicking on the website https://apps.learning.amplify.com/patternsofearthandsky/
Login to your Amplify account.
Once in the SimâŠ
Turn constellations ON at the top of the Sim.
In System View - click and drag your Earth so it is between Pegasus and the Sun.
In System View - Click on the word âPegasus.â This will highlight it in yellow.
Click on NOON for your time. In Sky View - click on the Sun and record the distance to the sun.
Click on MIDNIGHT.
Click the stars in the four corners of Pegasus and record their distance in the table.
Answer the discussion question below.

How many light years is ALPHERATZ from Earth?
How many light years is BETA PEGASI from Earth?
Directions: Below is a section of âHow Big is Big? How Far is Far?â Read it to answer the next two questions.
đ According to the text, where are the stars in space?
The stars are ____
According to this diagram, are the stars the same distance or different distance from Earth.
The stars are ______ distance from Earth.
đ Check For Understanding
Which star or stars are inside the solar system?
đ Which star or stars are outside the solar system?
Use the data table below to answer this question.
Criteria For Success (CFS)
Read the labels for each column
Read the numbers
Use the data to answer the questions
đ Check For Understanding
Explain the difference between the sun and other stars. Which is closer?
How does the data table supports your answer.
On the data table, it shows the _______,
Which means _________.
The other stars are _______
What direction are the stars in space?
Criteria For Success:
Include the direction of the stars
Include the distance of the stars

đ The picture above shows the stars in the constellation the Big Dipper.
Are the stars in the Big Dipper closer or farther from Earth than the Sun? How do you know?
đ Your friend says that all the stars in the Big Dipper are probably the same distance away from Earth because they all look like tiny spots of light.
Do you agree or disagree with your friend?
Support your response with evidence from the SIM or from the Great Square of Pegasus class model.
How many light years is ALGENIB from Earth?
How many light years is MARKAB from Earth?
đ Check For Understanding
Are the four stars in Pegasus different distances away from Earth or the same distance away from Earth?
Which answer is evidence that best supports (shows or proves) your answer.
đ CFU: Are all stars the same distance away from Earth?