TerraStella

Open TerraStella and you see, right away, what the sky above you is doing at this moment. Then the rest of space opens up: live data from NASA and citizen-science projects, in plain language, with no ads.

🌅 SKY TODAY
The home screen is a living sky card for your location: the current phase of the day, how long until sunset or sunrise, how high the Sun is, and what phase the Moon is in. Go deeper for golden hour, solar noon, day length, moonrise and moonset, azimuths and every stage of twilight. Exactly what you need to plan a shot, a walk, or an evening with a telescope.

🌌 SOMETHING NEW EVERY DAY
NASA's Picture of the Day — a new space photo or video every day, with the astronomers' own explanation; open any past date from the calendar. Plus a daily digest of space news with real sources you can open yourself, and a separate archive where you read the news day by day.

🛰️ WATCH IT LIVE
Follow the International Space Station in real time on a world map, or switch to NASA's live video stream from orbit. Find out when the ISS, Tiangong or Hubble will pass in front of the Moon from a point you choose — a rare, precisely timed alignment you can actually go and see. And look at where meteorites fell, the ground shook and wildfires burned near you, from NASA and USGS data.

🔴 DISTANT WORLDS
Real photos from the Curiosity and Perseverance rovers, filterable by camera, Martian sol or Earth date. And full-disk views of Earth from the EPIC camera — taken a million miles out at the Sun-Earth L1 point, where you can watch the whole planet turn.

✨ YOUR SKY MOMENT
See what the sky looked like on a date that matters to you — a birthday, a child's birth, a wedding, or another meaningful moment. Along with real facts about that day. Give the date a name of your own, save the beautiful sky card as an image, and share it. Your first date is free.

🧠 A GAME, AND REAL SCIENCE
Test your sense of scale in quick rounds: which is bigger, farther, hotter or older. Every answer comes with the real numbers behind it, and fresh questions keep arriving. And if you want to help for real, classify genuine scientific data through Zooniverse: galaxies in Galaxy Zoo, auroras in Aurora Zoo, solar wind in Space Umbrella, nearby stars in Backyard Worlds. No account or experience required.

⭐ YOURS
Keep everything that caught your eye in favorites. Puzzled by a photo? Ask the AI to explain it in plain language. Save several observing places under names of your own and switch between them with one tap. Language, theme and the rest live in settings.

🔒 NO ADS, NO NAGGING
No screen ever asks you for a permission on its own — not location, not notifications. There are no ads. Your data is not sold. Full English and Ukrainian localization, light and dark themes, offline caching so your favorites and recent photos are always available, and accessibility support throughout.

Just space, explained simply — for anyone curious about what's up there.