AstroShort

Astro Explorer · Free on the App Store

The universe, within reach.

Fly from our Sun to a real black hole. Walk into real places on Earth, Mars and the Moon. Every fact is sourced from NASA — and read aloud.

Download on theApp Store A game is coming
  • No ads
  • No accounts
  • No tracking
  • Works offline

Explore

One tap from a planet to the edge of the galaxy.

  1. 01

    Rise to any world

    Saturn's rings, Europa's ice, our own Moon — tap a world and fly straight to it.

  2. 02

    Pull back to the whole system

    The Sun and all eight planets on their orbits, every one labelled and touchable.

  3. 03

    Keep going

    Until the Sun is a speck, the Milky Way's core glows, and Andromeda drifts into view.

  4. 04

    Arrive at the heart

    Sagittarius A*, the black hole at our galaxy's centre — with the real Event Horizon Telescope image on its plate.

Saturn up close in the app — its rings tilted against the stars, with nearby worlds labelled. The solar system in the app — the Sun and all eight planets on labelled orbits. The galaxy view in the app — the Milky Way's spiral from outside, Andromeda in the distance. Sagittarius A* in the app — the black hole at the Milky Way's centre with a field note about its mass.

Real screens from the app.

Compare

Put any two worlds side by side.

Drawn to true scale with NASA's numbers — the moment a size finally lands. Try the Sun.

Source — NASA NSSDC planetary fact sheets · textures: Solar System Scope (CC BY 4.0), NASA New Horizons

Go inside

Real places, honestly told.

Drill into Earth, Mars and the Moon — Uluru, coral reefs, the Apollo landing sites. Each one carries a real photograph and a story with its source attached.

Uluru glowing orange at sunset, shown on its observation plate in the app.

Uluru at sunset

Photograph: Jörn Wellniak (Weyf) · CC0

Jezero Crater on Mars — NASA's image of the ancient river delta, with the fact that it was once a lake.

“Long ago, this was a real lake.”

Jezero Crater · NASA / JPL / JHU-APL / MSSS / Brown University

Listen

Every world is read aloud.

A warm voice names each world and tells you something true — so anyone can explore, reading or not. This is the actual voice from the app.

Coming soon · free, inside Astro Explorer

Next: build a base on the Moon.

You land with nothing but a lander. Mine ice, turn it into water, trade with the ships that touch down, and grow a crew of robots — until your base can launch a rocket of its own. Then Mars.

  • Real science underneath. Water ice at the lunar poles, air and fuel made on site — the ideas real missions are built on.
  • Calm by design. No timers, no fail states, no paid randomness, no notifications nagging you back.
  • Moon and Mars. Two bases, one wallet, a robot crew that runs the shop.

Your base

  1. Mine ice
  2. Make water
  3. Ships land
  4. Earn coins
  5. Build machines
  6. Launch

Principles

No ads. No accounts. No tracking. Every fact sourced. The whole universe, even offline.

Private by design

No sign-up, no profiles, zero analytics. Exploring stays on the device.

Honest by rule

Sizes, distances and temperatures come from NASA and the IAU. Where scale is stylised so small worlds stay visible, we say so.

Two modes

Explorer, a clean star-atlas with depth one tap away. Kid, a playful skin for small hands with the deep facts behind a parent gesture.

Works on a plane

The core runs offline. The one online extra — a daily discovery feed — is a plain anonymous request you can switch off.

Read the two-minute privacy policy →

Built together

Your ideas become real features.

  1. 1

    Say it

    Speak an idea inside the app. It turns into text on the device — no audio ever leaves the phone.

  2. 2

    Send it

    Every idea is reviewed on screen first. Nothing is sent without an explicit tap.

  3. 3

    Watch it arrive

    The best ideas get built and ship as free updates. The Builders Board shows what everyone is wishing for — no names attached.

Built for one curious kid.
Grown for every curious mind.

Download on theApp Store

Free. No ads, no accounts, works offline.