consider the material version,
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This review is from: The Universe: In 100 Key Discoveries (Kindle Edition)
this provides excellent coverage of the topic and is full of interesting material. i was concerned it might just be100 factoids but no, it's so much richer than that. the beginning of each 'discovery' comprises a rather contrived intro in the form of 4 sentences, in block capitals, supposed to let you know what it's about and why it's there. that can be rather irritating and often appears forced. ignore that and enjoy the clarity of what follows. Giles appears to be a writer who is enthralled by his subject and wants to let you know as much as he reasonably can about this exciting, and rapidly advancing, area of science without a scrap of formality to get in the way.
the kindle edition must be the best value reading material ever (it has loads of information in it) but you might want to consider the paper version because what you don't get with the kindle are some truly amazing colour images.