Today was a very special day for star-gazers and astronomers. For about 7 hours planet Mercury crossed the sun which is a quite seldom event. At 11:12 UTC Mercury started to show up in front of the sun and left again at 18:42 UTC. The little planet will not transit again until 2019 and then again 2032. More information can of course be found on wikipedia.
For me it was great to see this with my own eyes and again getting an idea of how huge the sun is compared to all the planets. On the pictures untrained eyes have to look twice to recognize little Mercury. Simply fantastic!