Astronomy Picture of the Day . Sand Dunes on Mars . ... Infrared Horsehead . ... The false-color picture shows the bright infrared emission from dust and molecular gas in part of the Orion star forming region surrounding the Horsehead Nebula. ... This color "picture" of globular star cluster M55 may not look like any star cluster you've ever seen. ... Two weeks ago during the launch of Atlantis, the Sun, Earth, Moon, and rocket were all properly aligned for this photogenic coincidence. ...