Splendid. In the review of the Setting Book I stated that Art took precedence over content. Way more art in the first book than in this one. This book however is chock full of content. Everything is fully explained in Fate Core rules.
The first section of the book is taken up with how Strange Stars differs from regular Fate (not much). You could even run a game without the Fate Core rules if you wanted (but why since you can get the Fate Core rules for free on this site?).
The remaining sections cover character creation. You have High Concept, Trouble and Stangeness as your first three Aspects. Strangeness should add some weirdness to the mix. Life in the Strange Stars is going to leave you affected--maybe you have an unusual gadget, or ethos, what have you.
Clade templates--Each clade is referenced with page number in the Setting Book. There are aliens galore in the Strange Stars and most of them are "human". Every clade mentioned in the Setting book is here and encouragement abounds to make your own.
Adventures and campaigns. If you are used to Fate Core the lightness of this section will not daunt you. There are enough ideas here to get your juices flowing.
Threats. A plethora of threats to use, but not enough to fill a universe. Just enough to figure out how to create your own to match your weird universe.
Worlds and Cluster creation I'll lump together. If you have played Diaspora (for sale on this site) you will understand how this works. Several differences bear mentioning. You are not tied to just the worlds of a cluster. Hyper Gates connect to at least one other of the areas in the Setting book. Higher technology is sought after not feared.
Finally, Factions are given several pages and a reason for existence. Many Fate Core books mention factions but this is the first time I remember any one discussing how they impact the PCs during roleplay.
Overall this is a very good addition to the Fate Core products that exist out there. It will take a bit of work to create your universe, but that is unlikely to deter anyone used to many of the Fate products out there.