Astronomers See “Warm” Glow of Uranus’s Rings
Uranus’ rings are usually invisible except for the largest telescopes. And they are surprisingly bright in new heat images of the planet taken by two large telescopes in the high deserts of Chile.
The thermal glow gives astronomers another window onto the rings, which have been seen only because they reflect a little light in the visible, or optical, range and in the near-infrared. The new images taken by the Atacama Large Millimeter/submillimeter Array (ALMA) and the Very Large Telescope (VLT) allowed astronomers to measure the temperature of the rings for the very first time. It measures 77 Kelvin, or 77 degrees above absolute zero — the boiling temperature of liquid nitrogen and equivalent to 320 degrees below zero Fahrenheit.
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