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What (who) is E Nebula - definition
E Nebula
PAIR OF DARK NEBULAE IN THE CONSTELLATION AQUILA THAT LOOKS LIKE THE LETTER E OF THE LATIN ALPHABET
Barnard 142; Barnard 143; Bernard 143; Bernard 142
The "E" or "Barnard's E" Nebula (officially designated as Barnard 142 and 143) is a pair of dark nebula in the Aquila constellation. It is a well-defined dark area on a background of Milky Way consisting of countless stars of all magnitudes.
Protoplanetary nebula
![Hubble's]] Advanced Camera for Surveys.](https://commons.wikimedia.org/wiki/Special:FilePath/IRAS 20068+4051.jpg?width=200 "Hubble's]] Advanced Camera for Surveys.")
TYPE OF ASTRONOMICAL OBJECT
Protoplanetary nebulae; Preplanetary nebula; Post-AGB Star; Proto-planetary nebulae
A protoplanetary nebula or preplanetary nebula (PPN, plural PPNe) is an astronomical object which is at the short-lived episode during a star's rapid evolution between the late asymptotic giant branch (LAGB) phase and the subsequent planetary nebula (PN) phase. A PPN emits strongly in infrared radiation, and is a kind of reflection nebula.
Iris Nebula
DARK NEBULA
NGC 7023; Iris nebula; NGC7023; Caldwell 4
The Iris Nebula (also known as NGC 7023 and Caldwell 4) is a bright reflection nebula in the constellation Cepheus. The designation NGC 7023 refers to the open cluster within the larger reflection nebula designated LBN 487.
