Grown-ups
This is a children's science experience about what a world needs, and what another world does not give for free.
A four-year-old can stop after a picture and one question. An older child can keep looking: pressure, radiation, closed loops, planetary protection, and what remains unknown.
Two questions stay distinct. Could people live there, and could life exist there, are not the same. Habitable is not used to mean comfortable for humans.
Imagination is wanted. Physics, chemistry, biology, energy, materials, distance, and time still have to sign the drawing. Constraints make engineering interesting.
Eve is xAI's voice. She reads our written science when you press Listen with Eve. She does not autoplay. The browser's own voice is never asked to pretend to be her. The readings were made in advance, so pressing listen plays a recording. It does not send a child's voice, name, or place. On a world page she waits at Keep looking. A second recording is a second sitting. You can stop after the first.
Missions appear when a measurement or a vehicle is the point: Curiosity's radiation detector, Perseverance's oxygen experiment, Huygens at Titan, Europa Clipper on the way. Existing capability, planned work, proposals, and speculation are named as such.
On a tablet you can add this to the home screen. That is an icon on the home screen, not a downloaded encyclopedia. We do not trap the science in an offline copy, so a correction can still arrive. There are no notifications, streaks, or reminders to come back. If Eve is reading, the lock screen can pause her, skip, and see where she is. It does not send a name or a place.