It’s not a bad book. I actually learned quite a bit, given that it’s been more than 20 years since my college astronomy classes, and this is an ever changing branch of science. It’s got a good sturdy binding and current information.  The trouble is that it’s hard to judge who the target audience is. Follett lists it as interest level 3-6, and reading level 6.5. It looks designed for younger readers, but it deals with some pretty sophisticated science. In order to make sense of it, the reader must already have some understanding of protons and neutrons and atoms and quarks and plasma, as only some of those words rank a place in the glossary, and then the definitions are pretty minimal. Also it’s guilty of my pet peeve about timelines: listing chronological events horizontally does not a timeline make, unless the spacing along the line represents the passage of time. In this one, two inches once represents less than half a million years, and later on the same line represents 8 billion years. Ugh!