Curated OER
How Big Is That Star?
Aspiring astronomers study stars. They compare stars and explain the relationship between radius, mass, and diameter. By creating a star simulation, they discover how a binary star system's orbit can cause changes in the observed...
K5 Learning
Space Based Astronomy
How much astronomy can you study with the naked eye? Learn more about the ways scientists explore the galaxy with a short reading passage and set of short-answer questions.