Click on the picture to see the computer blinking between two pictures taken at different times. You're looking for an object that appears in one, but not the other. If you look closely at David Lane's images, you should be able to pick out an object that's only in one of them. Mona Evans, "Young Astronomers Reveal the Universe" http://www.bellaonline.com/articles/art18718.asp
Antennas of the Atacama Large Millimeter/submillimeter Array (ALMA), on the Chajnantor Plateau in the Chilean Andes. The Large and Small Magellanic Clouds, two companion galaxies to our own Milky Way galaxy, can be seen as bright smudges in the night sky, in the centre of the photograph. (Credit: ESO/C. Malin) Mona Evans, "Hidden Universe 3D - film" http://www.bellaonline.com/articles/art183545.asp
Very Large Telescope. Part of the European Southern Observatory (ESO) and located on Cerro Paranal in the Atacama desert. (Photo: ESO/G.Hüdepohl) Mona Evans, "Hidden Universe 3D" http://www.bellaonline.com/articles
The Kepler Space Telescope. Precision Pointing: It's a Matter of Scale. (Image credit: NASA Ames/Wendy Stenzel.) The next time you're asked to pass the salt think of the Kepler space telescope, and share its story. Mona Evans, "Searching for Extrasolar Planets" http://www.bellaonline.com/articles/art66984.asp
ESA?s Herschel space observatory set against a background image of the Vela C star-forming region. Copyright ESA/PACS & SPIRE Consortia, T. Hill, F. Motte, Laboratoire AIM Paris-Saclay, CEA/IRFU ? CNRS/INSU ? Uni. Paris Diderot, HOBYS Key Programme Consortium.