- A star is born (Part 3 cont.: Evidence of a protostar in a Bok globule)
- A star is born (Part 3: The Virial Theorem, Jeans mass and Bok globules)
- How bright is a star? Introducing apparent and absolute magnitude
- How bright is a star? Introducing luminosity and its use for calculating distances
- How far from earth is a star? What is Parallax?