Lots of cool photos from NASA, as always, from the Shuttle Atlantis mission to repair the Hubble telescope, but this might be the best of the bunch. Here's what the smart guys had to say about the shot:
Transiting the Sun
In this tightly cropped image, the NASA space shuttle Atlantis is seen in silhouette during solar transit, Tuesday, May 12, 2009, from Florida. This image was made before Atlantis and the crew of STS-125 had grappled the Hubble Space Telescope.
The phtographer made this image using a solar-filtered Takahashi 5-inch refracting telescope and a Canon 5D Mark II digital camera.