Astronomy Picture of the Day . Dueling Auroras . ... Will it be curtains for one of these auroras? A quick inspection indicates that it is curtains for both, as the designation "curtains" well categorizes the type of aurora pattern pictured. ... Three years ago results were first presented indicating that most of the energy in our universe is not in stars or galaxies but is tied to space itself. ... Meteor Storm Sights and Sounds . ... Ancient Layered Rocks on Mars . ...