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Pebble Plus; Exploring the Galaxy; Exploremos la galaxia Books in Order

Pebble Plus; Exploring the Galaxy; Exploremos la galaxia is a 3-book series by Thomas K. Adamson for ages 5–8, at a grades 1–4 reading level, with gentle content (HootRated intensity 1/5).

Books
3
By publication date
Reading level
Grades 1–4
Average grade level 2.9
Recommended ages
Ages 5–8
From HootRated age ratings
Content intensity
Gentle
HootRated 1/5

Pebble Plus; Exploring the Galaxy; Exploremos la galaxia Reading Order

Series numbers aren't available for most Pebble Plus; Exploring the Galaxy; Exploremos la galaxia books, so they're listed by publication date (oldest first).

# Title Reading Level Ages Content
1 Júpiter
2005
Level 1-2 5-8 Gentle
2 Neptuno
2005
Level 3-4 5-8 Gentle
3 Urano
2005
Level 3-4 5-8 Gentle

Content Intensity Across the Series

Consistent

Content stays at a steady intensity level throughout the series.

1
2
3
First book Latest book

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. Pebble Plus; Exploring the Galaxy; Exploremos la galaxia (3 books by Thomas K. Adamson) lands at a grades 1–4 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 Pebble Plus; Exploring the Galaxy; Exploremos la galaxia Books

Júpiter

Thomas K. Adamson

Cover of Júpiter

Júpiter

Thomas K. Adamson

Level 1-2

Neptuno

Thomas K. Adamson

Cover of Neptuno

Neptuno

Thomas K. Adamson

Level 3-4

Urano

Thomas K. Adamson

Cover of Urano

Urano

Thomas K. Adamson

Level 3-4

Similar reading level, content intensity and themes.

Enjoy This Series in Other Languages

3 editions available in other languages.

es Spanish (3)

Júpiter

Thomas K. Adamson

Cover of Júpiter

Júpiter

Thomas K. Adamson

Level 1-2

Neptuno

Thomas K. Adamson

Cover of Neptuno

Neptuno

Thomas K. Adamson

Level 3-4

Urano

Thomas K. Adamson

Cover of Urano

Urano

Thomas K. Adamson

Level 3-4

Questions about the Pebble Plus; Exploring the Galaxy; Exploremos la galaxia series

What reading level is the Pebble Plus; Exploring the Galaxy; Exploremos la galaxia series?
Pebble Plus; Exploring the Galaxy; Exploremos la galaxia books are at a grades 1–4 reading level (average grade level 2.9), and HootRated recommends the series for ages 5–8. There are 3 books in the series.
What order should I read the Pebble Plus; Exploring the Galaxy; Exploremos la galaxia books?
Series numbers aren't available for most Pebble Plus; Exploring the Galaxy; Exploremos la galaxia books, so HootRated lists them by publication date: Júpiter (2005); Neptuno (2005); Urano (2005).
What age is the Pebble Plus; Exploring the Galaxy; Exploremos la galaxia series appropriate for?
HootRated recommends Pebble Plus; Exploring the Galaxy; Exploremos la galaxia 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.