... Crescent Saturn . ... Victoria Crater on Mars . ... Will the Universe End in a Big Rip . ... Part of a larger emission nebula with a distinctive shape, popularly called The Pelican Nebula, the ridge spans about 10 light-years following the curve of the cosmic pelican's head and neck. ... I Zwicky 18: The Case of the Aging Galaxy . ... The galaxy on the left, I Zwicky 18, was once thought to be one of the youngest galaxies on record since its bright stars indicated an age of only 500 million years. ...