Encyclopedia: Solar System
Planets, moons & exploration
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Explore planets, moons and the discoveries beyond Earth. Choose five articles free, save your favorites, and continue your journey through the solar system.
Travel through our celestial neighborhood in 386 illustrated articles on the Sun, planets, moons, smaller bodies and the history of solar-system exploration.
START WITH FIVE FREE ARTICLES
New readers can choose any five different articles. Your chosen articles stay unlocked, and revisiting them never uses another choice. Existing readers keep previously granted access.
MAKE DISCOVERIES YOUR OWN
• Search article titles and full text
• Follow links between related topics
• Save articles and return to your reading position
• Continue recent reading and track your progress
• Explore connections through the timeline and graph
• Find article sources and image credits inside the app
CHOOSE YOUR ACCESS
Own the full encyclopedia with a one-time purchase for complete offline reading. Or choose monthly or annual Premium for the full encyclopedia plus AI chat grounded in this subject's articles. Eligible new Premium subscribers receive a three-day introductory trial. Subscriptions renew automatically unless canceled through your App Store account. Current local prices and terms appear before purchase.
Restore Purchases recovers eligible previous purchases. Earlier full-version ownership includes encyclopedia and offline access; Premium AI requires a subscription. Internet access is required for AI chat and purchases. AI answers may contain errors; consult the linked sources.
Article text is derived from Wikipedia. Images come from appropriately licensed Wikimedia Commons and other open sources. Source links, licenses and credits are available in the app.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
More reliable upgrade options when prices are slow to load or temporarily unavailable. Clearer retry and purchase feedback, with easier recovery when returning to the app. Your chosen articles and eligible purchases remain protected.
The developer, Good Spider, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- User Content
- Identifiers
- Other Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Good Spider, LLC
- Size
- 337.2 MB
- Category
- Education
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Full Version $9.99
- Annual Premium $19.99
- Monthly Premium $2.99
- Copyright
- © 2026 Good Spider, LLC