... Why are some older stars surrounded by dust? ... Visible in the above image of Saturn are bright bands, dark belts and a dark spot right over the South Pole. ... Shown in this stunning false-color Hubble Space Telescope image, the galaxy's disk - composed of spectacular star clusters in winding spiral arms and dramatic dark lanes of dust - spans some 70,000 light-years. ... Not a glimpse of this cluster of stars can be seen in the inset visible light image (lower right). ...