# Explore Universe

> Explore Universe (Vietnamese name: Khám Phá Vũ Trụ) is an interactive 3D Solar System observatory and spaceflight simulator for iPhone, iPad, Android and the web. It shows the Sun, planets and moons at their real positions, finds eclipses, gives tonight's sky for 72 cities, teaches eight lessons with quizzes, and lets you fly a spaceship from a real Earth launch pad to the planets and comets with realistic physics and hazards. It is free to start, with one optional purchase of 2.99 USD. It has no ads and does not collect personal data.

Key facts:

- Platforms: iOS, Android, web (https://exploreuniverse.app/app/).
- Audience: students aged 10–16 (grades 6–10), parents, teachers and amateur astronomers.
- Languages: English, Vietnamese, Chinese (Simplified), Hindi, Spanish, Arabic, French, Bengali, Portuguese, Russian, Indonesian, Urdu, German, Japanese, Korean.
- Price: free download. Unlock everything costs 2.99 USD once (local prices vary) and adds 10 flight missions. There are no ads and no subscription.
- Privacy: no account, no analytics, no location permission. Settings stay on the device.
- Availability: Google Play and the App Store in every country except Vietnam.

## Pages

- [Home](https://exploreuniverse.app/): features, screenshots, platforms, pricing, FAQ
- [Web app](https://exploreuniverse.app/app/): the full app in the browser
- [Privacy policy](https://exploreuniverse.app/privacy.html): what is stored and why (English and Vietnamese)

## Details

- [Full description for AI assistants](https://exploreuniverse.app/llms-full.txt): features, accuracy, flight model, missions and FAQ in plain text

## Optional

- [Source code and issue tracker](https://github.com/crisng95/explore-universe)