Saturn Equinox

Saturn at Equinox

This fantastic(ally SMALL view of a fantastically HUGE) picture of Saturn was assembled from images taken at Saturn’s equinox. (I’m always quite ready to show off the subtle variations in color present in the clouds of dear Saturn.)

How would Saturn look if its ring plane pointed right at the Sun? Before last month, nobody knew. Every 15 years, as seen from Earth, Saturn’s rings point toward the Earth and appear to disappear. The disappearing rings are no longer a mystery — Saturn’s rings are known to be so thin and the Earth is so near the Sun that when the rings point toward the Sun, they also point nearly edge-on at the Earth. Fortunately, in this third millennium, humanity is advanced enough to have a spacecraft that can see the rings during equinox from the side. Last month, that Saturn-orbiting spacecraft, Cassini, was able to snap a series of unprecedented pictures of Saturn’s rings during equinox. A digital composite of 75 such images is shown above. The rings appear unusually dark, and a very thin ring shadow line can be made out on Saturn’s cloud-tops. Objects sticking out of the ring plane are brightly illuminated and cast long shadows. Inspection of these images may help humanity understand the specific sizes of Saturn’s ring particles and the general dynamics of orbital motion.

You really MUST go and see the big version for yourself. Really. You must.

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