... But consider this well planned animated sequence combining 23 pictures taken at approximately 2 week intervals from June 2000 through May 2001. Finding Dark Matter . ... Where is dark matter? ... But does dark matter exist in the greater universe too -- and if so, where? ... Visible in the image center are massive stars in the open cluster. ... Also known as Barnard 33, the unusual shape was first discovered on a photographic plate in the late 1800s. Ganymede: Torn Comet Crater Chain . ... June . ...