Little Astronauts; Smithsonian Little Explorer Books in Order
Little Astronauts; Smithsonian Little Explorer is a 2-book series by Kathryn Clay for ages 5–8, at a grade 4 reading level, with gentle content (HootRated intensity 1/5).
- Books
- 2
- By publication date
- Content intensity
- Gentle
- HootRated 1/5
Little Astronauts; Smithsonian Little Explorer Reading Order
Series numbers aren't available for most Little Astronauts; Smithsonian Little Explorer books, so they're listed by publication date (oldest first).
| # | Title | Reading Level | Ages | Content |
|---|---|---|---|---|
| 1 | Astronaut in Training 2017 | Level 4 | 5-8 | Gentle |
| 2 | Spacewalks 2017 | Level 4-5 | 5-8 | Gentle |
Content Intensity Across the Series
ConsistentContent stays at a steady intensity level throughout the series.
Series books grow with readers — but that's also the trap. Most series start at one reading level and one content intensity and drift upward over the course of the run. Little Astronauts; Smithsonian Little Explorer (2 books by Kathryn Clay) lands at a grade 4 reading level, with average content intensity 1/5. Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.
The reading-order table above lists every book with per-volume reading level, age and intensity ratings so you can spot any escalation before it catches your reader off guard. For a deeper dive into how we score text difficulty vs. emotional weight separately — and why series readers especially benefit from that split — see our methodology page.
All Little Astronauts; Smithsonian Little Explorer Books
Series Like Little Astronauts; Smithsonian Little Explorer: What to Read Next
Similar reading level, content intensity and themes.
- Little Paleontologist; Smithsonian Little Explorer by Kathryn Clay 4 books · Grades 4–5 · gentle content
- Checkerboard Library; Trees (Abdo) by John F. Prevost 6 books · Grades 3–4 · gentle content
- Meet the Dinosaurs by Don Lessem 9 books · Grades 3–4 · gentle content
- Can You Find It? (Gareth Stevens) by Dee Phillips 4 books · Grades 3–5 · gentle content
- Snakes (ABDO); Checkerboard Library by James E. Gerholdt 9 books · Grades 3–5 · gentle to mild content
- My Favorite Dinosaurs by Emily Kington 3 books · Grade 4 · gentle content
Questions about the Little Astronauts; Smithsonian Little Explorer series
- What reading level is the Little Astronauts; Smithsonian Little Explorer series?
- Little Astronauts; Smithsonian Little Explorer books are at a grade 4 reading level (average grade level 4.1), and HootRated recommends the series for ages 5–8. There are 2 books in the series.
- What order should I read the Little Astronauts; Smithsonian Little Explorer books?
- Series numbers aren't available for most Little Astronauts; Smithsonian Little Explorer books, so HootRated lists them by publication date: Astronaut in Training (2017); Spacewalks (2017).
- What age is the Little Astronauts; Smithsonian Little Explorer series appropriate for?
- HootRated recommends Little Astronauts; Smithsonian Little Explorer for ages 5–8. Content is gentle (HootRated intensity 1/5). Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.