Section 1 of 6
Clusters
Stars that formed together and stayed. Every entry says what the object is, how far off it lies, and what it looks like through glass rather than in a photograph.
A hundred thousand stars in a ball
Globulars are older than the galaxy's disc and orbit it as a halo. Through glass they resolve at the edges before the middle.
Open clusters
Young, loose, and dispersing — a family that will not stay together.
Resolving the edge
Where a fuzzy ball turns into individual stars, and what decides that.
The colour nobody sees
Cluster stars have real colours; the eye rarely gets any of them.