What object was once called nebulae?

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  • What object was once called nebulae?


Charles Messier then compiled a catalog of 103 "nebulae" (now called Messier objects, ... Objects named nebulae belong to four major groups.
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Positive: 77 %
Planetary nebulae are generally faint objects; ... are called forbidden lines ... shell around the core and then slowly cooling once the hydrogen shell is ...
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Positive: 74 %

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Nebula definition, Also called diffuse nebula. a cloud ... this object resembles a nebula. ... light from background stars—are called absorption nebulae.
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Positive: 77 %
Types of Nebulae. Originally, the word ... the word "nebula" referred to almost any extended astronomical object ... Also called "galactic clusters ...
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Positive: 72 %
Planetary Nebulae and White Dwarfs. ... so it is once again ... While the object is still visible, it is called a white dwarf, and it occupies the lower ...
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Positive: 58 %
... There are believed to be about 20,000 objects called planetary nebulae in the ... nebulae are small objects, ... Once again the outer regions of ...
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Positive: 35 %

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