This Isn’t Saturn

uranus_irThis is a near-infrared view of Uranus with its rings and some of its moons. It was made by the 8.2-m VLT ANTU telescope at the ESO Paranal Observatory in Chile. The contrast between the rings and the planet is strongly enhanced at the wavelength at which this picture was made; the incoming sunlight is almost completely absorbed by gaseous methane present in the planetary atmosphere causing Uranus to appear unsually dark, but the icy material in the rings reflects the sunlight and appears relatively bright.

Uranus is unique among the planets of the solar system in having its axis of rotation tilted almost 90°. When Voyager 2 flew by in 1986, the south pole was pointed toward the Earth. In this picture made 16 years later (and about 20 percent of the away around the planet’s orbit), the Uranian ring system were seen at an angle comparable to Saturn’s when its ring system is most open.

Seven moons of Uranus are in the picture Titania and Oberon are the brightest. The much smaller and fainter Puck and Portia have visual magnitude about 21 and are barely visible in the photo.

Image Credit: ESO

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