Editing Proplyd (section)

== History ==
In 1979 observations with the [[André Lallemand|Lallemand electronic camera]] at the [[Pic du Midi Observatory|Pic-du-Midi Observatory]] showed six unresolved high-ionization sources near the [[Trapezium Cluster]]. These sources were not interpreted as proplyds, but as partly ionized globules (PIGs). The idea was that these objects are being ionized from the outside by [[Orion Nebula|M42]].<ref>{{Cite journal|last1=Laques|first1=P.|last2=Vidal|first2=J. L.|date=March 1979|title=Detection of a new kind of condensations in the center of the Orion Nebula, by means of S 20 photocathodes associated with a Lallemand electronic camera.|journal=Astronomy & Astrophysics|language=en|volume=73|pages=97–106|bibcode=1979A&A....73...97L|issn=0004-6361}}</ref> Later observations with the [[Very Large Array]] showed solar-system-sized condensations associated with these sources. Here the idea appeared that these objects might be low-mass stars surrounded by an evaporating protostellar accretion disk.<ref>{{Cite journal|last1=Churchwell|first1=E.|last2=Felli|first2=M.|last3=Wood|first3=D. O. S.|last4=Massi|first4=M.|date=October 1987|title=Solar System--sized Condensations in the Orion Nebula|journal=Astrophysical Journal|language=en|volume=321|pages=516|doi=10.1086/165648|bibcode=1987ApJ...321..516C|issn=0004-637X|doi-access=free}}</ref>

Proplyds were clearly resolved in 1993 using images of the [[Hubble Space Telescope]] Wide Field Camera and the term "proplyd" was used.<ref>{{Cite journal|last1=O'dell|first1=C. R.|last2=Wen|first2=Zheng|last3=Hu|first3=Xihai|date=June 1993|title=Discovery of New Objects in the Orion Nebula on HST Images: Shocks, Compact Sources, and Protoplanetary Disks|journal=Astrophysical Journal|language=en|volume=410|pages=696|doi=10.1086/172786|bibcode=1993ApJ...410..696O|issn=0004-637X|doi-access=free}}</ref>