Red Rectangle Nebula [SEP] constellation
Red Rectangle Nebula
The Red Rectangle Nebula, so called because of its red color and unique rectangular shape, is a protoplanetary nebula in the Monoceros constellation. Also known as HD 44179, the nebula was discovered in 1973 during a rocket flight associated with the AFCRL Infrared Sky Survey called Hi Star. The binary system at the center of the nebula was first discovered by Robert Grant Aitken in 1915.
Characteristics.
High-resolution images of it in visible and near infrared light reveal a highly symmetric, compact bipolar nebula
its origin (associated to a stable, extended disk) is different than for most protoplanetary nebulae. 
External links.
- The remarkable Red Rectangle: A Stairway to Heaven?
- Dying Star Sculpts Rungs of Gas and Dust
- Charged polycyclic aromatic hydrocarbon clusters and the galactic red emission, 2007.
- Astronomy Picture of the Day – The Red Rectangle Nebula from Hubble (14 June 2010)
- The Red Rectangle