Astronomy Picture of the Day . ... How do dying stars eject their outer layers? Stars that create elegant planetary nebulas like Henize 3-401, pictured above, are not unusual, causing speculation that, one day, our own Sun may look like this. A Star Cluster in Motion . ... A Setting Sun Trail . ... NGC 1569: Heavy Elements from a Small Galaxy . ... For the open cluster of stars NGC 6520, every day is like this. On the left of the above picture are many of NGC 6520's bright blue stars. ...