During the morning of 7 May 2003, the planet Mercury will slip across the face of the Sun in a rare event, known as a transit. There are only about 12 celestial alignments like this every century and you cannot view them safely without special telescopic equipment. So, let the ESA/NASA solar watchdog, SOHO, do all the hard work for you…
Read more:
http://www.esa.int/export/esaCP/SEM05IR1VED_Expanding_0.html