Review Space-10

The light area on the left side of this photo is the Milky Way. What is the Milky Way?

  1. A constellation.

    No. The Milky Way contains many more stars than a constellation.
  2. A solar system.

    No. A solar system only has one star, not a huge number of stars.
  3. A galaxy.

    Yes! Our solar system is part of the Milky Way galaxy. When we lived in the city, the lights made it difficult to see the Milky Way. Now that we live far from city lights, it is amazingly easy to see.
  4. A universe.

    No. The Milky Way is only a small part of the entire universe.

Click to see which state standards this question tests, and which of my videos, experiments, and other resources support that topic.


SC.5.E.5.1 Recognize that a galaxy consists of gas, dust, and many stars, including any objects orbiting the stars. Identify our home galaxy as the Milky Way.
Review Space-2 practice
Review Space-1 practice
Review Space-10 practice

SC.8.E.5.3 Distinguish the hierarchical relationships between planets and other astronomical bodies relative to solar system, galaxy, and universe, including distance, size, and composition.
Making a Scale Model of the Solar System video, free, ClosedCaptions
Planets and Pennies video, ClosedCaptions
How Far is That Planet? text page, free
Review Space-3 practice
Review Space-2 practice
Review Space-10 practice


UT.6.IV.1.c Compare the size of the Solar System to the size of the Milky Way galaxy.
Review Space-2 practice
Review Space-10 practice


MS-ESS1-2 Develop and use a model to describe the role of gravity in the motions within galaxies and the solar system.
Planets and Pennies video, ClosedCaptions
Review Space-13 quest
Review Space-10 practice