Join Donate

Emily LakdawallaDecember 31, 2009

Planetary Society Advent Calendar for December 31: Uranus

Did you think I was going to skip Uranus? How could I? I keep coming back to Uranus as one of my favorite places in the solar system, because there's so much to see there, yet it's been so little explored and is quite likely to remain so. Until we visit it again, we do the best with what we have, which is the images from Voyager 2. Björn Jónsson created this view of Uranus using pretty much the same steps as he used to create the view of Neptune that I posted earlier, which means you can put the two pictures next to each other to compare their colors.

Color global view of Uranus from Voyager 2

NASA / JPL / Björn Jónsson

Uranus

The images for this color composite of Uranus were obtained by Voyager 2 through orange, green, and blue filters on January 14, 1986 from a range of 12.6 million kilometers. The color has been adjusted to approximate what a human eye would see, although the human eye is sensitive to longer wavelengths of light than the Voyager cameras were. At the time Voyager flew by, little detail was visible in Uranus' atmosphere, though more might have been if Voyager could see into red and infrared wavelengths. Since the flyby, as Uranus has passed through its equinox, it has displayed many more cloud features.

Here's that side-by-side comparison.

Uranus (left) and Neptune (right)

NASA / JPL / Bjorn Jonsson

Uranus (left) and Neptune (right)
The images for these two color composites were obtained by the same spacecraft through the same sets of filters and processed in the same way, so should accurately represent the relative colors of Uranus and Neptune at the times that Voyager 2 passed by them.

Really, they are very, very similar. We don't have one blue-green world and one blue one, as the two are so often depicted. They're pretty much the same methane blue; Uranus just had more high haze, making it whiter (not greener) than Neptune. Now that the Uranian equinox is past and atmospheric circulation is producing storms I'll bet they'd look even more similar from up close.

Uranus is not quite the end of my calendar series; there'll be one final post tomorrow. Happy New Year to all!


Each day in December I'm posting a new global shot of a solar system body, processed by an amateur. Go to the blog homepage to open the most recent door in the planetary advent calendar!

We know you love reading about space exploration, but did you know you can make it happen?

Take our Space Priorities survey and consider a gift to our Space Policy and Advocacy program to fuel more missions, more science, and more exploration.

Read more: pretty pictures, amateur image processing, Voyager 1 and 2, Neptune, global views, Uranus

You are here:
Headshot of Emily Lakdawalla (2017, alternate)
Emily Lakdawalla

Senior Editor and Planetary Evangelist for The Planetary Society
Read more articles by Emily Lakdawalla

Comments & Sharing
Mars
Your Space Priorities

Moon or Mars? Low-Earth orbit or deep space? Share your voice for space exploration.

Take Survey

Mars
More Space Exploration

More Missions. More Science. More Exploration. Your support is essential and leads to the joy of discovery.

Donate