The solar system’s past
Follow the evidence of how planets formed and the changes that shaped our cosmic neighbourhood.
Explore your way to understanding the universe
Learn astronomy by exploring.
Astraea is an astronomy learning app with constellation maps, questions, history and mythology. Explore the universe and the cultures that have observed it, at your own pace.
Discover Astraea 1.5Available nowFree download. Includes ads and in-app purchases.
Store not opening? Open the app menu and choose Open in browser.
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Actual screenshot of Astraea 1.5
How learning works in Astraea
One question can change what you see.
This is a short sample from the first region. Observe the sky, choose an answer and discover what lies behind your intuition.
Sample lesson
Two stars appear close in Orion. Must they be physically close?
Two stars can look close together from Earth while being far apart in space. Constellation lines represent a pattern we imagine when looking at the sky.
Concept: NASA Space Place
One route, many connections
From your first sky map to the big questions.
Recognize a pattern. Understand a phenomenon. Discover how different cultures have seen the same sky.
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Actual screenshot of Astraea 1.5
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Actual screenshot of Astraea 1.5
Look it up without losing your place
A new word does not have to stop you.
Look up a concept within the lesson and return right where you were. Understanding the vocabulary is part of the discovery.
- Predictions before seeing the answer
- Maps and relationships between objects
- Quizzes with immediate explanations
Science and stories, clearly separated
One sky. Many ways of seeing it.
From constellation patterns to Moon viewing in Japan. Discover the science behind what you see and the stories that grew around it.
Scientific explanations and cultural stories are clearly distinguished.
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Actual screenshot of Astraea 1.5
A rhythm that fits your day
There is always another question to follow.
A short curiosity, the daily quiz and widgets help you return without losing your way. Your streak supports the learning journey.
- Daily curiosity One short idea that changes how you see the universe.
- Practice A short quiz to test your knowledge.
- Continuity Widgets and visible progress that help you resume your journey.
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Astraea app screenshot and Home Screen widget
More sky. More stories. More of you.
Four new regions connect science, history, images and cultures of the sky. Version 1.5 adds 23 lessons, 30 journal entries and a collection of 19 illustrated objects.
- 4
- new regions
- 23
- new lessons
- 30
- new journal entries
- 19
- collectibles
Four ways to keep exploring.
Space travel
Explore orbits, encounters, manoeuvres and the distances between a mission and its reply.
Images of the cosmos
Discover what light, colour and instruments reveal behind astronomical images.
Skies of Japan
Explore stories, calendars and experiences such as Moon viewing, with their cultural and astronomical context.
Night Compass. A piece from your collection.
A place for your discoveries.
Unlock 19 collectibles connected to what you learn. Discover the story of each piece and choose a favourite to display on your profile.
Every piece has a meaning, illustrated details and a learning milestone.
See the in-app gallery
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Your journey has its own style.
Personalise your rocket and give each launch an appearance that feels like you. Version 1.5 includes Platinum and Platinum Eclipse styles with Premium.
Premium Observatory
Return to an idea. See it in a new light.
The Premium Observatory connects your answers with what to practise next. Return to mistakes, understand the explanation and keep exploring.
- Personalised seven-question reviews, with unlimited sessions.
- A notebook to revisit your mistakes and their explanations.
Premium also includes an ad-free experience, a Platinum rocket and badge. The paid subscription provides five streak protectors per month, up to ten saved.
One review session is available free each day. Premium adds unlimited sessions, a mistake notebook and detailed learning insights.
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Screenshot of the Premium Observatory.
Before you start
The essentials before you begin.
What Astraea is, how learning works and what the update includes.
What is Astraea?
Astraea is an astronomy learning app in English and Spanish. It combines lessons, constellation maps, questions with explanations, history, mythology and experiences connected to the sky.
Do I need any astronomy knowledge?
No. Astraea is designed to start from zero and move step by step through different regions of the cosmos.
What can I learn with Astraea?
Astronomy, constellations, stars, planets and galaxies, alongside the history of their observation, mythology and traditions from different cultures. Science and stories are presented in their own context.
Is Astraea free?
Astraea is free to download and you can start learning without subscribing. The app contains ads and offers optional Premium. Prices and the terms of any offer appear in the store before purchase.
Is Astraea available in English and Spanish?
Yes. The interface, lessons, quizzes, daily content and widgets are available in both languages.
Which devices support Astraea?
Astraea is available for iPhone, iPad and Android on the App Store and Google Play. Version 1.5 adapts the experience to tablet screens while preserving map proportions.
What is new in Astraea 1.5?
Astraea 1.5 adds four regions, 23 lessons and 30 new journal entries, 19 collectibles and more rocket personalisation. It also improves the Observatory, animations and tablet layouts.
What does the Premium Observatory include?
It includes personalised seven-question reviews with unlimited sessions, a mistake notebook with explanations and detailed learning insights. One daily review remains available free.
What are the learning experiences like?
Observe a map or illustration, make a prediction and discover the explanation. Explore quizzes, connections between ideas, a contextual glossary and experiences such as Moon viewing in the skies of Japan.
How does a Premium trial offer work?
When the store offers a trial to your account, it shows its duration, the price afterwards and the terms before confirmation. Eligibility depends on the store and your subscription history; not every account receives the same offer.
Your next discovery starts here.
Download Astraea and begin a guided route through the universe, at your own pace.
Store not opening? Open the app menu and choose Open in browser.
No previous knowledge needed. Available in English and Spanish.
