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A few dynamic challenges... Everybody knows that the Universe is dynamic. Even absolute beginners immediately recall the day/night sequence, the ever-changing lunar phases, the year's seasons, etc. The Universe has its own time-scale though.
Click-drag green circle to pan around the whole image. The Ultra Deep Field obtained by the Hubble Space Telescope is the deepest view into the sky by humankind to date. This image combines 800 frames with a total exposure time of 1 million seconds.
First Ever STEREO Images of the Entire Sun › Download Latest image of the far side of the Sun based on high resolution STEREO data, taken on February 2, 2011 at 23:56 UT when there was still a small gap between the STEREO Ahead and Behind data. This gap will start to close on February 6, 2011, when the spacecraft achieve 180 degree separation, and will completely close over the next several days. Credit: NASA