As NASA’s Cassini spacecraft makes its unprecedented series of weekly dives between Saturn and its rings, scientists are finding—so far—that the planet’s magnetic field has no discernable tilt. This surprising observation, which means the true length of Saturn’s day is still unknown, is just one of several early insights from the final phase of Cassini’s mission, known as the Grand Finale.
Other recent science highlights include promising hints about the structure and composition of the icy rings, along with high-resolution images of the rings and Saturn’s atmosphere.
Cassini is now in the 15th of 22 weekly orbits that pass through the narrow gap between Saturn and its rings. The spacecraft began its finale on April 26 and will continue its dives until Sept. 15, when it will make a mission-ending plunge into Saturn’s atmosphere.