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Stories, updates, insights, and original analysis from The Planetary Society.

HiRISE Imager Primary Mirror

Gravity's Bow

Timothy Reed explains how optical telescopes are tested for gravity sag, and the methods used to counteract or compensate for it.

Io and Europa from New Horizons (Emily Lakdawalla's version)

Aloha, Io

Taking a look at Jupiter's moon, Io, from Hawaii.

Cassini Mission Overview

Designing the Cassini Tour

Each Titan flyby is not a fork in the road, but rather a Los Angeles style cloverleaf in terms of the dizzying number of possible destinations. So how did our current and future plans for the path of the Cassini spacecraft come to be? That's the question Dave Seal put to me since that's my job -- I am a tour designer.

Prometheus Invading F Ring

Canto III: Hints of Equinox

Saturn is rapidly approaching equinox, where the Sun passes through the ring plane (south-to-north, i.e. the northern vernal equinox), and its ring system (i.e. its great now-gloomy poorly-lit circles of large blocks of water ice) is starting to show some really interesting behavior.

Cassini Mission Overview

Connections

David Seal muses on his time as the mission planner for Cassini, and the history behind its name, and astronomy in Rome.

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