... Europa's Surface . ... The criss-crossing dark streaks may indeed be cracks in its ice-covered surface caused by Jupiter's tidal stresses accompanied by the freezing and expansion of an underlying layer of water. Leo Triplet Spiral Galaxy M65 . ... Spiral galaxy M65 is a normal spiral galaxy not unlike our own Milky Way. ... Interstellar dust grains - composed predominantly of carbon - absorb visible starlight and reradiate much of it in the infrared. ... Early Microscopic Life on Mars? ...