On November 8, 2006, Mercury slowly slid across the face of the sun during an event known as a transit. A transit of Mercury is relatively rare—there are only about a dozen in a century. The Exploratorium's expedition crew was at the Kitt Peak National Observatory, and, with the Kitt Peak ... More »

On November 8, 2006, Mercury slowly slid across the face of the sun during an event known as a transit. A transit of Mercury is relatively rare—there are only about a dozen in a century. The Exploratorium's expedition crew was at the Kitt Peak National Observatory, and, with the Kitt Peak staff, we webcast a brief transit introduction program followed by a webcast of the transit: a live five-hour telescope feed with commentary at the top of each hour. You can also view brief videos and still images from the 1999 Mercury transit. Less «