... MyCn18: An Hourglass Planetary Nebula . ... The sands of time are running out for the central star of this hourglass-shaped planetary nebula. ... Recorded on August 2, this telescopic composite image catches Comet Garradd (C/2009 P1) in the same field of view as globular star cluster M15. ... This unexpected mystery has come to light only in the past few weeks since the robotic Dawn mission became the first spacecraft to orbit the second largest object in the asteroid belt between Mars and Jupiter. ...