Where In The Universe #72

Article written: 24 Sep , 2009
Updated: 24 Dec , 2015

Here’s this week’s image for the WITU Challenge, to test your visual knowledge of the cosmos. You know the drill: take a look at this image and see if you can determine where in the universe this image is from; give yourself extra points if you can name the spacecraft responsible for the image. We’ll provide the image today, but won’t reveal the answer until tomorrow. This gives you a chance to mull over the image and provide your answer/guess in the comment section. Please, no links or extensive explanations of what you think this is — give everyone the chance to guess.

Click here if you want to look back at all previous Where In the Universe Challenges.

UPDATE: The answer has now been posted below.

Ariel transits Uranus. Credit: NASA, ESA, L. Sromovsky (University of Wisconsin, Madison), H. Hammel (Space Science Institute), and K. Rages (SETI)

Ariel transits Uranus. Credit: NASA, ESA, L. Sromovsky (University of Wisconsin, Madison), H. Hammel (Space Science Institute), and K. Rages (SETI)

This image from the Hubble Space Telescope is a never-before-seen astronomical alignment of a moon traversing the face of Uranus, and its accompanying shadow. The white dot near the center of Uranus’ blue-green disk is the icy moon Ariel. The 700-mile-diameter satellite is casting a shadow onto the cloud tops of Uranus. To an observer on Uranus, this would appear as a solar eclipse, where the moon briefly blocks out the Sun as its shadow races across Uranus’s cloud tops.

Check back again soon for another WITU challenge!

19 Responses

  1. scibuff says

    I’m gonna go with Triton Transit of Neptune by HST

  2. scibuff says

    … or on second thought, Ariel transits Uranus (by HST)

  3. Nephish777 says

    Uranus and Ariel, July 26, 2006, by the Hubble Space telescope

  4. Jorge says

    That’s Uranus and one of its moons, shot not too long ago by Hubble.

  5. bits says

    First time I could recognise something on “Where in the Universe” !

    Ariel – Uranus – Hubble.

  6. Dagon says

    The moon Ariel casting a shadow on Uranus shot by Hubble.

  7. mwbiggs says

    It’s Uranus. Note the placement of the shadow of moon and the direction of the cloud bands.

    The only spacecraft that could take this photo is Hubble.

    Not sure what Moon it is. Must be one of the 4 big ones based on the size of the shadow.

  8. Sili says

    My guess was Neptune, too, just from the colour. I’m so ignorant.

    That said, I hope to see missions to the ice giants before I die.

  9. vino says

    I think it is Triton transit on Neptune….

  10. vino says

    Alas, looking at the other posters..seems like i am off a planet 🙁

  11. Russ says

    This is Uranus with the white dot is the icy moon Ariel, ths shot was produced by Hubble.

  12. Member
    ToSeek says

    I was thinking Neptune at first glance but am inclined to agree with the majority of the comments that it’s Uranus and Ariel.

  13. William928 says

    I was thinking Neptune initially as well, based on the color. However, I think I have to agree with the other posters, Uranus and Ariel, picture by HST.

  14. ironflange says

    HST shot of Triton transiting Neptune, flipped on its side to make it trickier. I don’t think any of Uranus’ moons are large enough to cast a shadow that size, and Neptune has better defined cloud bands, too.

  15. stile86 says

    Uranus because of the angle of its axis. Couldn’t be from Voyager 2 because it looked bland back then and the image would be clearer. Has to be Hubble. The moon? Don’t know I’ll have to look that up.

  16. rudeyd says

    It is Matilda transit of Uranus from Hubble…………

  17. Hannes says

    It is a famous german washing powder starting with the letter A which circles around Uranus.The picture was taken at on July 26, 2006 at about 15:30 UTC by a non human being.

  18. Vanamonde says

    Hey, don’t forget Voyager 2, the only spacecraft to visit (and image) all four of the gas giants. But I will go with the peer pressure (and with the fuzziness of the focus) and agreed that it was taken with the HST. It *IS* a reflector, you know.

  19. Mr.No.Scope says

    Well, since Nancy is so late in giving the answer to this one, I still have time to chime in:

    HST took this charming little photograph of the giant planet Uranus and it’s moon, Ariel.

    Oh no, it’s Mr. Bill!

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