The Cassini spacecraft made its deepest dip ever into the atmosphere of Titan, Saturn’s largest moon, at 8:28 p.m. Eastern time on June 20. The data it collected will help determine whether the moon has its own magnetic field.

“For Titan scientists, this is one of the most anticipated flybys of the whole mission,” wrote space physicist Cesar Bertucci of the Institute of Astronomy and Space Physics in Buenos Aires, Argentina in a blog post. That’s saying something, as Cassini has already orbited Saturn for six years and may last seven more.

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