Don’t let its pretty exterior and bright rings fool you — you won’t like vacationing on Saturn. After Jupiter it is the second largest planet in our solar system — 9.5 times the size of earth at the equator, and like Jupiter it is a gas giant. While its gravity is comparable to that of earth, there is no solid surface for spacecraft to land on, so all we know about the planet we have learned from several flybys, including those of the twin Voyager spacecraft.

On this day, July 25, in 1981, almost a year after its sister ship visited the giant planet, Voyager 2 passed by Saturn and collected data.

Voyager 1 spent more time with Saturn’s moons, particularly Titan, which is thought to be able to host primal bacterial life (though no evidence of such has been found/) Voyager 2 meanwhile probed the planet’s outer atmosphere, discovering yet another reason why it would not do for a vacation spot. As one of the furthest planet from the sun, it gets pretty cold — in some places the temperature drops to  -70 Kelvin (-333 F). But on the bright side, it does warm up in spots to a balmy -130 Kelvin (-226 Farenheit.)