20th Century YA and Middle Grade Science Fiction (617 books)

This list is for YA and middle grade science fiction published in the 20th century.

No fantasy! Science fiction only, encompassing futuristic, dystopian, post-apocalyptic, and space themed stories. Books on this list must be published for the YA and middle grade market.

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1	A Wrinkle in Time (Time Quintet, #1) by Madeleine L'Engle 3.97 avg rating — 1,269,567 ratings score: 1,693, and 18 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
2	The Giver (The Giver, #1) by Lois Lowry (Goodreads Author) 4.12 avg rating — 2,758,120 ratings score: 1,364, and 14 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
3	Ender’s Game (Ender's Saga, #1) by Orson Scott Card 4.31 avg rating — 1,458,556 ratings score: 1,090, and 11 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
4	Mrs. Frisby and the Rats of NIMH by Robert C. O'Brien 4.17 avg rating — 184,324 ratings score: 559, and 6 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
5	The Tripods Trilogy (The Tripods, #1-3) by John Christopher 4.20 avg rating — 3,022 ratings score: 444, and 5 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
6	Enchantress from the Stars (Elana, #1) by Sylvia Engdahl (Goodreads Author) 3.95 avg rating — 4,166 ratings score: 429, and 5 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
7	A Wind in the Door (Time Quintet, #2) by Madeleine L'Engle 3.99 avg rating — 131,379 ratings score: 422, and 5 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
8	This Time of Darkness by Helen Mary Hoover 4.29 avg rating — 702 ratings score: 391, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
9	A Wrinkle in Time Quintet: Books 1-5 (A Wrinkle in Time Quintet, #1-5) by Madeleine L'Engle 4.34 avg rating — 5,271 ratings score: 388, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
10	The Girl Who Owned a City by O.T. Nelson 3.79 avg rating — 5,431 ratings score: 378, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
11	Gathering Blue (The Giver, #2) by Lois Lowry (Goodreads Author) 3.82 avg rating — 206,373 ratings score: 376, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
12	Escape to Witch Mountain by Alexander Key 3.91 avg rating — 3,639 ratings score: 373, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
13	Have Space Suit—Will Travel by Robert A. Heinlein 3.93 avg rating — 31,151 ratings score: 369, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
14	Anna to the Infinite Power by Mildred Ames 3.94 avg rating — 636 ratings score: 362, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
15	A Swiftly Tilting Planet (Time Quintet, #3) by Madeleine L'Engle 4.07 avg rating — 111,126 ratings score: 327, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
16	The White Mountains (The Tripods, #1) by John Christopher 3.95 avg rating — 14,555 ratings score: 324, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
17	Searching for Lucky #3002: A Ben and Blue Mystery by Ellen Melissa Cohen 4.71 avg rating — 38 ratings score: 300, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
18	This Place Has No Atmosphere by Paula Danziger 3.85 avg rating — 1,789 ratings score: 292, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
19	Podkayne of Mars by Robert A. Heinlein 3.67 avg rating — 9,466 ratings score: 290, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
20	A Tale of Time City by Diana Wynne Jones 3.86 avg rating — 5,414 ratings score: 287, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
20	The Last Book in the Universe by Rodman Philbrick 3.91 avg rating — 10,176 ratings score: 287, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
22	Out of the Silent Planet (The Space Trilogy, #1) by C.S. Lewis 3.93 avg rating — 104,771 ratings score: 284, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
23	Winter of Fire by Sherryl Jordan 4.31 avg rating — 2,682 ratings score: 280, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
24	Children of the Dust by Louise Lawrence really liked it 4.00 avg rating — 2,213 ratings score: 279, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
25	The Rolling Stones by Robert A. Heinlein 3.89 avg rating — 7,732 ratings score: 277, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
26	The Forgotten Door by Alexander Key 4.11 avg rating — 2,784 ratings score: 276, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
27	The Silver Metal Lover (Silver Metal Lover, #1) by Tanith Lee 4.04 avg rating — 4,192 ratings score: 273, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
28	Brother in the Land by Robert Swindells 3.96 avg rating — 1,516 ratings score: 271, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
29	Empty World by John Christopher 3.83 avg rating — 976 ratings score: 269, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
30	Jumper (Jumper, #1) by Steven Gould (Goodreads Author) 3.93 avg rating — 15,937 ratings score: 268, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
31	The Girl with the Silver Eyes by Willo Davis Roberts 4.02 avg rating — 10,787 ratings score: 267, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
32	Among the Hidden (Shadow Children, #1) by Margaret Peterson Haddix 3.99 avg rating — 130,325 ratings score: 266, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
33	Journey Between Worlds by Sylvia Engdahl (Goodreads Author) 3.66 avg rating — 180 ratings score: 264, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
34	The Ear, the Eye, and the Arm by Nancy Farmer (Goodreads Author) 3.87 avg rating — 16,329 ratings score: 255, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
35	When the Tripods Came by John Christopher 3.81 avg rating — 4,812 ratings score: 240, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
35	The Keeper of the Isis Light (Isis, #1) by Monica Hughes 3.87 avg rating — 1,398 ratings score: 240, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
37	Z for Zachariah by Robert C. O'Brien 3.68 avg rating — 17,565 ratings score: 237, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
38	The Iron Giant by Ted Hughes 3.87 avg rating — 12,524 ratings score: 226, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
39	The Wonderful Flight to the Mushroom Planet (The Mushroom Planet, #1) by Eleanor Cameron 4.03 avg rating — 2,593 ratings score: 222, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
40	The City of Gold and Lead by John Christopher 4.08 avg rating — 8,965 ratings score: 206, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
41	Beyond the Dark River by Monica Hughes 3.52 avg rating — 23 ratings score: 203, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
42	Rite of Passage by Alexei Panshin 3.82 avg rating — 3,743 ratings score: 200, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
43	The Domes of Mars (Maurice Gray, #2) by Patrick Moore 3.80 avg rating — 5 ratings score: 199, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
43	A Princess of Mars (Barsoom, #1) by Edgar Rice Burroughs 3.81 avg rating — 60,001 ratings score: 199, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
45	Orphans of the Sky by Robert A. Heinlein 3.79 avg rating — 11,698 ratings score: 196, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
46	The Martian Tales Trilogy (Barsoom #1-3) by Edgar Rice Burroughs 4.05 avg rating — 9,876 ratings score: 192, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
47	The Green Book by Jill Paton Walsh 3.69 avg rating — 1,748 ratings score: 191, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
48	The Runaway Robot by Lester del Rey 4.02 avg rating — 505 ratings score: 190, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
49	The Space Ship Under the Apple Tree by Louis Slobodkin 4.08 avg rating — 204 ratings score: 189, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
49	Kindred: Young Adult Edition by Octavia E. Butler 4.31 avg rating — 263,346 ratings score: 189, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
51	The Alliance by Gerald N. Lund (Goodreads Author) 4.22 avg rating — 4,551 ratings score: 186, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
52	Devil on My Back (Arc One, #1) by Monica Hughes 4.12 avg rating — 439 ratings score: 185, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
53	Ray Bradbury's The Martian Chronicles: The Authorized Adaptation (Ray Bradbury Graphic Novels) by Dennis Calero (Illustrator) 3.75 avg rating — 816 ratings score: 184, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
54	An Acceptable Time (Time Quintet, #5) by Madeleine L'Engle 3.78 avg rating — 23,637 ratings score: 180, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
55	The Isis Trilogy by Monica Hughes 4.22 avg rating — 54 ratings score: 177, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
56	The Hermit Thrush Sings by Susan Butler 4.14 avg rating — 456 ratings score: 176, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
56	Children of Morrow by Helen Mary Hoover 4.17 avg rating — 276 ratings score: 176, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
58	Off the Road by Nina Bawden 3.05 avg rating — 75 ratings score: 174, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
59	The Ennead by Jan Mark 3.27 avg rating — 49 ratings score: 173, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
60	Sprockets: A Little Robot by Alexander Key 4.45 avg rating — 38 ratings score: 172, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
61	The Far Side of Evil (Elana, #2) by Sylvia Engdahl (Goodreads Author) 3.98 avg rating — 558 ratings score: 171, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
62	But We Are Not of Earth by Jean E. Karl 4.16 avg rating — 97 ratings score: 167, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
63	Alan Mendelsohn, the Boy from Mars by Daniel Pinkwater 4.35 avg rating — 1,045 ratings score: 166, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
64	The Last Children by Gudrun Pausewang 3.93 avg rating — 1,093 ratings score: 165, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
64	Eva by Peter Dickinson 3.43 avg rating — 2,250 ratings score: 165, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
66	Moon of Three Rings (Moon Magic, #1) by Andre Norton 3.97 avg rating — 912 ratings score: 163, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
67	Shade's Children by Garth Nix (Goodreads Author) 3.91 avg rating — 13,571 ratings score: 160, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
67	The Cure by Sonia Levitin 3.82 avg rating — 892 ratings score: 160, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
69	Children of Time by Deborah Moulton really liked it 4.00 avg rating — 36 ratings score: 159, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
69	Star Born (Pax/Astra, #2) by Andre Norton 3.91 avg rating — 1,708 ratings score: 159, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
71	A Rag, a Bone and a Hank of Hair by Nicholas Fisk 4.04 avg rating — 206 ratings score: 158, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
72	Journey Outside by Mary Q. Steele 3.69 avg rating — 321 ratings score: 153, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
73	Found by June Oldham 3.29 avg rating — 102 ratings score: 150, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
73	Star Dog by A.M. Lightner 4.12 avg rating — 100 ratings score: 150, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
75	Futuretrack 5 by Robert Westall 3.97 avg rating — 225 ratings score: 147, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
75	Galax-Arena by Gillian Rubinstein 3.82 avg rating — 775 ratings score: 147, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
77	Those Who Fall from the Sun by Josephine Rector Stone 3.33 avg rating — 3 ratings score: 146, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
78	Return from Witch Mountain by Alexander Key 3.79 avg rating — 611 ratings score: 143, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
79	Out There by Adrien Stoutenburg really liked it 4.00 avg rating — 11 ratings score: 142, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
80	The Other Side of the Sun by Madeleine L'Engle 3.85 avg rating — 2,256 ratings score: 140, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
81	Invitation to the Game by Monica Hughes 3.79 avg rating — 5,665 ratings score: 137, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
82	Star Man's Son, 2250 A.D by Andre Norton 4.02 avg rating — 2,620 ratings score: 133, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
83	The City Beyond the Gates by N. Roy Clifton 4.11 avg rating — 9 ratings score: 128, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
84	Outside by Andre Norton 3.85 avg rating — 102 ratings score: 127, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
85	Why Weeps the Brogan? by Hugh Scott (Author and Illustrator) 3.76 avg rating — 34 ratings score: 126, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
86	David Starr, Space Ranger (Lucky Starr, #1) by Paul French (Pseudonym) 3.71 avg rating — 3,725 ratings score: 124, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
87	The Dying Sun by Gary L. Blackwood (Goodreads Author) really liked it 4.00 avg rating — 14 ratings score: 123, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
88	Matthew Looney's Voyage to the Earth (Matthew and Maria Looney, #1) by Jerome Beatty Jr. 4.22 avg rating — 101 ratings score: 121, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
89	Tom Swift and His Flying Lab (Tom Swift Jr., #1) by Victor Appleton II 3.83 avg rating — 628 ratings score: 120, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
89	Lucky Starr and the Pirates of the Asteroids (Lucky Starr, #2) by Isaac Asimov 3.67 avg rating — 2,353 ratings score: 120, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
91	Lucky Starr and the Big Sun of Mercury (Lucky Starr, #4) by Isaac Asimov 3.67 avg rating — 1,986 ratings score: 119, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
91	Matthew Looney's Invasion of the Earth (Matthew and Maria Looney, #2) by Jerome Beatty Jr. 4.06 avg rating — 67 ratings score: 119, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
91	Lucky Starr and the Oceans of Venus (Lucky Starr, #3) by Isaac Asimov 3.67 avg rating — 1,978 ratings score: 119, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
94	The Tomorrow City by Monica Hughes 3.67 avg rating — 168 ratings score: 118, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
95	Portal to E'ewere by Irma Walker 3.93 avg rating — 14 ratings score: 117, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
96	Lucky Starr and the Moons of Jupiter (Lucky Starr, #5) by Isaac Asimov 3.72 avg rating — 1,740 ratings score: 116, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
96	The Rings of Saturn (Lucky Starr, #6) by Paul French (Pseudonym) 3.72 avg rating — 1,638 ratings score: 116, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
98	Matthew Looney and the Space Pirates (Matthew and Maria Looney, #4) by Jerome Beatty Jr. 4.16 avg rating — 45 ratings score: 115, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
99	Encounter Near Venus by Leonard Wibberley 4.26 avg rating — 23 ratings score: 114, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
100	Lizard Music by Daniel Pinkwater 4.15 avg rating — 2,186 ratings score: 111, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars