Can any Redditors help me track down some science books from when I was a kid?

They were science books, geared towards kids, maybe 20-30 pages long, possibly with hard covers. There were pictures galore. There was one about space, one about dinosaurs, and they may have been a part of a mail order series, as I remember I wanted more but my parents wouldn't order any. I'm sure I'd recognize them if I saw the covers. I remember a large picture of the Sun in the space one, might have been in the book itself rather than the cover. I would have had these books during the mid-1980s.