Frosty, a space friend

Wobble, a space friend

Zen, a space friend

My sticker book

Tap a sparkling star on any page to meet a space friend and keep their sticker.

Quiet star field in the Saturn system

Saturn in the distance

Page 14 · Two surprising moons

Titan & Enceladus

Titan hides beneath orange haze and has methane lakes. Tiny, icy Enceladus sprays water-rich material from fractures near its south pole.

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Titan wrapped in a thick orange atmosphere

Bright icy Enceladus

Water-vapor and ice-grain plume rising from Enceladus's south polar region

Methane and ethane lakes

$Close teaching view of Enceladus's south-polar fractures$ Plumes above tiger-stripe fractures

Ari presenting Titan and Enceladus

Ari observing Titan's haze

Ari reacting to Enceladus's plume

Dot comparing two moons

Dot discovering Titan's lakes

Dot scanning Enceladus's plume

Two remarkable moons

Two very different sizes

Tap the diagram to replay its motion. Illustrations are explanatory.